You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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.

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: B
Why? 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.

New input: Article: White was the owner of a private school in a town. Last year, he married one of his classmates.The beautiful woman spent much time in learning nothing during middle school. But she wasn't worried about anything in the future, because her parents were very rich and could provide her with everything.So he could make poor Mr White listen to her. Mr White was busy in dealing with school affairs and his wife had to stay at home alone.But she hated the lonely and boring life.Her father introduced her to some businessmen who wanted to employ her .But she wanted to stay with children.So her husband was asked to allow her to work in his school.At first her husband didn't agree with her. She didn't supply money to him any more, so the poor man had to give in.Otherwise , his school would shut down for lack of her money. The woman could not teach students, because she knew neither maths nor physics.She thought she often played in the zoo,so she decided to teach biology.But she didn't know how to teach the subject at all.She thought hard, and finally she decided to bring the students to the zoo. Pointing to a crocodile, she shouted ,"Look at it carefully! It's a whale!" "Excuse me ,madam," said a student. "It's a crocodile!" "Shut up!" Mr White said angrily. "It's a whale!"
Question: Why did Mr White have to employ Mrs White as a teacher ?
Options: (A) Because his school would shut down without her money. (B) Because Mrs White learned many things during school time. (C) Because no businessman wanted to employ Mrs White. (D) Because Mrs White knew something about biology.
Solution:
A