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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: "Happiness isn't just feeling good.It's good for you and for society.Happy people are more successful, have better relationships, are healthier and live longer,"said Ed Diener, a professor of psychology at the University of Illinois. Beyond your genes Sonja, a professor of psychology at University of California Riverside, analyzed studies on identical twins and concluded that happiness is 50 percent genetic, 40 percent intentional and 10 percent circumstantial. "Your circumstances-where you live, your health, your work, your marriage-can be tough to change .But most people are surprised that circumstances don't account for as much of their happiness as they think,"she said. Life circumstances don't result in continuous happiness, she says, because we adapt.That new car, promotion or house feels great at first.Then we get used to it. Keeping that good feeling requires something else: control of how you act and think. Happiness definition To gain happiness, you need to understand what happiness is. Martin Seligman, a psychology professor at the University of Pennsylvania, says happiness is the pursuit of engaging and meaningful activities. By "engaging", he means when we get so absorbed in what we are doing that we lose track of time."Meaningful" would be using what you are best at to serve others or to participate in a cause that's bigger than yourself. "Your purpose doesn't have to be giant," says psychologist Dan Baker. "If you'reyou're your purpose can be getting into the college of your choice.When you're a parent, it can be getting your kids off to school safely and prepared for each day. External factors From 1981 to 2007, the World Values Survey took polls(lJ)all over the world and measured what it considers happiness and overall life satisfaction.Of the 52 countries that completed the surveys over the 17-year period, happiness increases in 45. According to the survey analysis, economic growth helped promote happiness for some, while Democratization and rising social tolerance contributed even more. Democracy provides more choice, which promotes happiness.Support for sex equality and tolerance of people who are different from oneself are also strongly linked.This is not just because tolerant people are happier, but because living in a tolerant society strengthens everyone's freedom.
Question: The World Values Survey suggests people are more likely to promote happiness if.
Options: (A) .they get much money or raise social states (B) .they live in a democratic and tolerance society (C) .they owns freedom and get support for sex quality (D) .they can choose to be those who are different from others
Solution:
B