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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: In Asia,there are special competitions where kites have complex designs and are fitted with instruments that make musical sounds as the wind blows through them.Although all kites have a similar structure ,they are widely different in size and shape.Kitefighting competitions are also held,in which competitors use their kites to attack and bring down their opponents' kites or cut their strings . For more than 15 years,the Big Wind Kite Factory has been giving kitemaking and kiteflying classes for the children on an island in Hawaii.In its kitemaking lessons,students can make kites in as little as 20 minutes!Children as young as four years old can learn how to fly a kite.Jonathan Socher and his wife Daphne started the kite factory in 1980.Their kites are made of nylon .Their designs are Hawaiian themes created by Daphne.The designs are cut out of the nylon with a hot knife that seals the edges and then fastened directly onto the kite. The kite that is used to give lessons is a regular diamond kite with a rainbow pattern.The difference between this kite and the ones they make during the lessons is that it is a twostring controllable kite.Big Wind employees fly the kite and for a few minutes show students how pulling on one line and then on the other controls the direction the kite goes in.Then the controls are given to the students. Jonathan insists that it is not necessary to make a huge impressive kite to have fun making and flying kites.Even the simplest structure can work,and can give hours of fun.Go on,give it a try! (2012*,D)
Question: Which of the following is TRUE according to the text?
Options: (A) A hot knife is used to iron the nylon. (B) Children never fly kites on their own in flying lessons. (C) Kite strings must not be cut in kitefighting competitions. (D) Daphne designs kites for the Big Wind Kite Factory.
Solution:
D