In this task, you're given an article, a question which often contains a blank and four options (associated with "A", "B", "C", "D"). Your task is to find the correct answer (from the given options) for the question from the given article and return one of the options from "A", "B", "C", and "D". Do not generate anything else apart from one of the following characters: "A", "B", "C", "D". There is only one correct answer for each question.

Q: Article: Life in the Clear Transparent animals let light pass through their bodies the same way light passes through a window. These animals typically live between the surface of the ocean and a depth of about 3,300 feet--as far as most light can reach. Most of them are extremely delicate and can be damaged by a simple touch. Sonke Johnsen, a scientist in biology, says, "These animals live through their life alone. They never touch anything unless they're eating it, or unless something is eating them." And they are as clear as glass. How does an animal become see-through? It's trickier than you might think. The objects around you are visible because they interact with light. Light typically travels in a straight line. But some materials slow and scatter  light, bouncing it away from its original path. Others absorb light, stopping it _ in its tracks. Both scattering and absorption make an object look different from other objects around it, so you can see it easily. But a transparent object doesn't absorb or scatter light, at least not very much, Light can pass through it without bending or stopping. That means a transparent object doesn't look very different from the surrounding air or water. You don't see it ----you see the things behind it. To become transparent, an animal needs to keep its body from absorbing or scattering light. Living materials can stop light because they contain pigments  that absorb specific colors of light. But a transparent animal doesn't have pigments, so its tissues won't absorb light. According to Johnsen, avoiding absorption is actually easy. The real challenge is preventing light from scattering. Animals are built of many different materials----skin, fat, and more----and light moves through each at a different speed. Every time light moves into a material with a new speed, it bends and scatters. Transparent animals use different tricks to fight scattering. Some animals are simply very small or extremely flat. Without much tissue to scatter light, it is easier to be see--through. Others build a large, clear mass of non-living jelly-lie material and spread themselves over it . Larger transparent animals have the biggest challenge, because they have to make all the different tissues in their bodies slow down light exactly as much as water does. They need to look uniform. But how they're doing it is still unknown. One thing is clear for these larger animals, staying transparent is an active process. When they die, they turn a non-transparent milky white. 
 Question: One way for an animal to become transparent is to   _  . 
 Options: (A) change the direction of light travel (B) gather materials to scatter light. (C) avoid the absorption of light (D) grow bigger to stop light.

A: C
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Q: Article: Astronaut Mark Kelly announced today that he is retiring from NASA in order to focus on the recovery of his wife, Gabrielle Giffords. Kelly, who is 47, began his NASA career in 1996. He has traveled to the International Space Station four times and served aboard space shuttles    Endeavour and Discovery.  Most recently he was commander of Endeavour's final voyage, which ended on June l.  "After 25 years of service to our country, I am retiring from the United States Navy and leaving NASA. My retirement will take effect on October l. " he said. "This was no easy decision. Words cannot express my deep gratitude for the opportunities I have been given to serve our great nation. And I have always been proud to be a member of the NASA. Public service has been more than a job for me and for my family. My brother continues to serve in NASA and in the Navy. My parents are retired police officers. And my wife Gabrielle proudly serves in the US House of Representatives." he continued.  "As life takes unexpected turns we frequently come to a crossroads. I am at this point today.  Gabrielle is working hard every day on her way to recovery.  I want to be by her side.  Stepping aside from my work in the Navy and at NASA will allow me to be with her and with my two daughters. I love them all very much and there is no doubt that we will move forward together. After some time off, I will look for new opportunities and I'm hopeful that one day I will again serve our country." Kelly said. On Jan 8, Giffords was shot in the head and was severely injured while meeting with her supporters. She returned to her Tucson home last week for the first time since then. 
 Question: Mark Kelly must have been_when he announced his decision. 
 Options: (A) regretful (B) cheerful (C) peaceful (D) meaningful

A: A
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Q: Article: I recall a moment that I experienced with my dad when I was twenty-one. I was going to college and living with a couple of friends in Chicago. When the car I was using died, my dad, realizing that I needed transportation to get to work and to school, was good enough to lend me the money for a used car. Shortly after I bought it, my parents drove down to San Diego for the winter. Before they left, my dad gave me some of his bank deposit slips   with clear and detailed instructions to put one hundred dollars of my earnings, every payday, into their savings account while they were gone. At that time of my life, I was not yet clear about what were the most important problems that I had to attend to first. I dismissed our agreement as nothing important and continued to spend my money as fast as I was making it, in pubs, on dates, and so on. Instead of honoring our agreement, I made payments that were less than the agreed-upon amounts, and on more than one occasion I made no payment at all.  When my parents arrived home in late March, I got a call from my dad, who said, "Don't go anywhere. I'm coming over." My dad was (and still is) a physical presence and had been a truck driver for thirty-five years. I felt ashamed and guilty, knowing that Dad had discovered that I hadn't held up my end of our bargain.  After he came in, he told me to sit down because he had a few things to tell me. There was no shouting, no red face with a vein about to burst on his forehead, and no bad language at all. His first words were, "When your mother and I got back into town yesterday, I called the bank. I can't say I was surprised to discover that you hadn't made all the payments. My first thought was to come here and take the car from you, but I want to tell you some things while I'm here. Maybe you'll understand, and maybe you won't." He went on to tell me, very calmly, about what it means to keep your word. He explained that when he was growing up after the Depression, a man's handshake and his word meant everything. He also told me that because I was twenty-one, he didn't feel angry so much as sad and disappointed. He closed by saying that our words and actions have a real effect on others, and that my words and actions were what others would measure me by. He added that if I hadn't yet formed some core or basic values and principles, this might be a good time to start thinking about those things. For the first time, I saw real disappointment on Dad's face. He gave me a second chance to make our deal right, and even gave me more deposit slips, saying, "I will take those keys if you miss a single payment or, at the very least, if you don't let me know in advance that you'll have trouble making a payment.  _ ." He spoke for about forty-five minutes, and I listened. He didn't expect me to say much, and I knew enough to keep quiet. I just nodded or shook my head at the right time and continued to listen. That time we spent together changed me forever. Then and there, I made a promise to myself that I'd never again be the cause of that look of sadness and disappointment on Dad's face. After that defining afternoon, our relationship got better and better. I'm now married with two sons of my own, and they're already learning about the importance of honor, trust, and honesty. 
 Question: The writer bought a second-hand car because   _  . 
 Options: (A) he was going to college (B) he was living with some friends (C) he was working while studying (D) his parents wanted to go to San Diego

A:
C
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