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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: Charlie works in a post office. His father lost his job five years ago and his mother is often ill. And he has two brothers and a sister. He works hard and tries his best to buy enough food for his family. Last month his family had to move to an old house outside the city. It's farther from the post office and he has to get up early in the morning in order to catch the 6:30 train. The head of his office is strict and everybody has to get there on time. He knows what it'll mean if he's late. A friend of his had pity on him and lent his old car to him. The young man was happy and from then on he could go to work by car. Last Saturday Charlie went to buy some medicine for his mother. Bad luck! When he came out of the shop, he couldn't find the car. He was quite worried and began to look for it in front of the shop but he didn't find it. Suddenly he saw a woman parked a car there and hurried into the shop. Charlie saw the car wasn't locked. He got on it and drove it at once. He was afraid the loser would run after him and drove fast. A truck hit it at a crossing and he lost consciousness. This morning the young man came back to life and saw there were a few policemen standing by his bed. He asked, "Where am I?" "In Room 103." "In hospital or in prison ?"
Question: There're _ people in Charlie's family.
Options: (A) four (B) five (C) six (D) seven
Solution:
C