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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: Peter loved to shop used articles. Almost a month ago, he bought popular word game that used little pieces of wood with different letters on them. As he was purchasing it, the salesgirl said, "Uh, look, the game box haven't even been opened yet. That might be worth some money. " Peter examined the box, and, sure enough, it was completely covered in factory-sealed plastic. And he saw a date of 1973 on the back of the box. "You should put that up for auction on the Internet, and see what happens."the salesgirl said. "Yes, you're right. People like something rare." Peter agreed, "I can't imagine there being very many unopened boxes of this game still around 40 years later." "Don't forget to tell me if you sell it." the salesgirl smiled. "No problem." Peter said. After he got home, Peter went online to several auction websites looking for his game. But he couldn't find it. Then he typed in the name of the word game and hit Search. The search result was 543 websites containing information about the changes of the game. Over the years, the game had been produced using letters in different sizes and game boards in different colors. He also found some lists of game fans looking for various versions of the game. Peter emailed some of them, telling them what he had. Two weeks later, Peter went back to the shop. "Hello. Do you still remember the unopened word game?" The salesgirl looked at him for a second, then recognized him and said, "Oh, hi!" "I've got something for you," Peter said. "I sold the game and made $1,000. Thank you for your suggestion." He handed her three $ 100 bills. "Wow!" the salesgirl cried out. "Thank you, I never expected it."
Question: Which of the following best describes Peter's word game?
Options: (A) It was made around 40 years ago. (B) It had game boards in different sizes. (C) It was kept in a plastic bag with a seal. (D) It had little pieces of wood in different colors.
Solution:
A