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.
One example: Article: Homework can put you in a bad mood , and that might actually be a good thing. Researchers from the University of Plymouth in England doubted whether mood might affect the way kids learn. To find out the answer, they did two experiments with children. The first experiment tested 30 kids. Someshapes were hidden inside a different, larger picture. The kids had to find the small shapes while sitting in a room with either cheerful or sad music playing in the background. To test their mood, the scientists asked the kids to point to one of five faces, from happy to sad. Children who listened to cheerful music tended to point to the smiley faces while the others pointed to the unhappy ones. The researchers found that sad kids took at least a second less to find the small shapes. They also found an average of three or four more shapes. In the second experiment, 61 children watched one of two scenes from a film. One scene was happy, and the other was sad. Just like in the first experiment, kids who saw the sad scene acted better compared to the others. The researchers guessed that feeling down makes people more likely to focus on a problem or difficult situation. Not all scientists agree with them, however. Other studies argued that maybe, that cheerful music in the first experiment distracted kids from finding shapes. While scientists work on finding out the answers, it still might be wise to choose when to do your tasks according to your mood. After eating a delicious ice cream, for example, write an essay. 
 Question: Researchers did experiments on kids in order to find out _ . 
 Options: (A) how they really feel when they are learning (B) whether mood affects their learning ability (C) what methods are easy for kids to learn (D) the relationship between sadness and happiness
Solution is here: B
Explanation: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment. So, B is the correct answer.

Now, solve this: Article: By 2012,the world may need to cope with as many as 50 million people who have fled their homeland,not for political or economic reasons but because the environment has been so badly changed that it cannot support life. The statement has been released by the United Nations to mark UN Disaster Reduction Day. More people are made homeless by environmental disasters than by war,according to the research by the Red Cross. That reality is proved by the earthquake in Pakistan. The widely publicized disaster has brought aid from the global community,according to Janos Bogardi,director of the United Nations University Institute for Environment and Human Security. "If we can move swiftly in and give them a new start where they are,then they may stay in the area. Otherwise,they become environmental refugees. Environmentalrelated migrations are most acute in SubSaharan Africa,but they also affect millions of people in Asia and India. Meanwhile,the United States is witnessing increased pressure from victims of mismanaged and worsening soil and water conditions in Mexico and Latin America." he says. Janos Bogardi says these refugees suffer from the impact of gradual environmental change--global warming,sea level rise,air and water pollution and more intense storms,floods and droughts that degrade the land. This is a slow process,but unfortunately a process that is very difficult to go backwards once final damage is done. Janos Bogardi says they are calling on the global community to recognize the serious situation of environmental refugees and to work together to lessen the impact of environmental disaster. 
 Question: What may be the best title of the passage? 
 Options: (A) 50 Million environmental refugees by 2010 (B) Environmental refugees--an international problem (C) The cause of environmental disasters (D) Global aid pouring in
Solution:
B