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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: If you want to make friends and form strong, lasting friendships, consider these suggestions. To make friends, you first need to put yourself out there somehow. Friends seldom come knocking on your door while you sit at home watching TV. Join a club with people who have common interests. You don't necessarily have to have a lot of common interests with people in order to make friends with them. In fact, some of the most rewarding friendships are between two people who don't have much in common at all, but if you have something in common with people, it can make it a lot easier to start a conversation and plan activities together. Use the web and get out! Websites like Meetup.com are aiming to bring people together with common interest. You can join any group or just start your own. If you don't know of a specific topic, try searching for just a location. It's a great way to meet new local people! Join a sports team. A common misconception about this is that you have to be really good at playing a particular sport in order to make friends with others on the team, but not all teams are so competitive. As long as you enjoy the sport and support your teammates, joining a local team with a laid-back attitude could be a great way to make new friends. Volunteer. Volunteering is a great way for people of all ages to meet others. By working together you build bonds with people, and you might meet others who have a passion for doing things the way you do. To make friends, besides spending more time around people, you also need to talk to people.
Question: Who is the passage written mainly for?
Options: (A) All the middle school students. (B) Both parents and children. (C) Those who want to make friends. (D) Those who want to make money.
Solution:
C