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.

Example Input: Article: All plant cells are capable of taking up water. Even dead ones do to a certain degree. Absorption of water by dead cell walls makes wood become larger. In common land plants, the living cells of roots take upmost of the water. Land plants without roots do exist, however. Those greenish-yellow lichens you see on rocks in the high mountains have no roots. Half a billion years ago, when water plants started to enter the land, the first land plants did not have roots. Even among the flowering plants, one finds rootless forms. These flowering plants are "the higher plants" because they evolved recently and are thus considered higher on the evolutionary scale . In the Peruvian desert, there grows one of these rootless higher plants, a bromeliad. It is a relative of the pineapple. Even if this plant had roots, they would be of no use, because where the plant grows, it never rains. The plant gets its water only from the dew it collects at night, when its leaves cool off. Such rootless plants, of course, can be moved with ease, but they will only grow when they are placed out in the open. If they are placed too near a house, the radiation from the heat of the house prevents the leaves from cooling and so prevents dew from forming, and the plant dies. In the southern United States and in Puerto Rico, one sees growing high above the streets on the insulation of electric wires. These plants get their water from rain, and the only soil they ever come in contact with is the dust that may blow on their leaves. 
 Question: Wood becomes larger because of    _    . 
 Options: (A) dead cell walls (B) water entering dead cells (C) the growth of cells (D) the death of cells
Example Output: B

Example Input: Article: "Let's go Dutch, shall we?" Jim said after a dinner to his friends in a restaurant. What does Jim mean? Long ago, there was a kind of dinner called Dutch treat  . At a Dutch treat, the invited guests were expected to pay for their own share of the food and drink. Now, Dutch treat means when friends go out to have fun, each person pays his or her own share. There are many other expressions related with "Dutch" in American English. However, most of them were first used in England in the 17th century. At that time, the British and the Dutch were war enemies. So when British people talked about something wrong or bad, they would like to use the word "Dutch". A common expression heard a few years ago was in Dutch. A friend may tell you, "You are in Dutch. The teacher is angry with you. Be careful!" When a soldier took Dutch leave, he left the army without permission. Dutch courage was the false courage produced by the effects of drinking wine. There is one expression that did come from the Dutch. That is to talk like a Dutch uncle. The Dutch were known for the strict and serious way they educated their children. 
 Question: What did people mean by saying "Let's go Dutch"? 
 Options: (A) The guests should leave first. (B) Each person should pay his or her own bill (C) The food should be better next time. (D) People should go to another restaurant.
Example Output: B

Example Input: Article: Since people first sent rockets into space in the 1950s, we have been leaving behind all sorts of things. Some of them, like the camera, were lost by astronauts while they did work outside their spaceship. But much of the space junk is made up of little pieces of things that were once bigger objects, until they struck each other and broke apart. Some things we send into space fall back toward the earth and burn up in the atmosphere. But larger pieces sometimes survive the extreme heat and hit the ground or the ocean at great speeds. So there is always concern that something may fall from the sky and do some harm. But space junk falling on housetops   is not the biggest worry. Scientists are concerned about what happens when an empty rocket strikes another while orbiting   the earth. Two big things become many smaller things. They then hit other things. The pieces get smaller and smaller until they form a cloud of junk that blocks the path of future space vehicles. So what can be done to clean up the space around our planet? Marco Castronuovo, an Italian researcher, talks about sending a satellite into space that would get very close to some of the larger pieces of space junk. The satellite would connect a small rocket to the useless object. When the rocket explodes, it pushes the junk into a lower and slower orbit, nearer the earth. After a time, the junk burns up in the atmosphere. Mr. Castronuovo has proposed   using a number of small satellites with robotic arms. One arm would catch the space junk, and another arm would connect the rocket. He imagines that each satellite would jump from one large piece of junk to another. He thinks this method could destroy about ten large objects each year. Scientists have been concerned about space junk for many years. Right now, the costs of the clean-up have been too great. Mr. Castronuovo says his system could be put in place for a much more reasonable amount of money. 
 Question: Much of the space junk   _  . 
 Options: (A) was thrown by the astronauts (B) is from broken spaceship (C) is made up of small pieces of things (D) returns to the earth piece by piece
Example Output:
C

