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.
Example: 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
Example solution: B
Example explanation: 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.

Problem: Article: Nanjing-style paper cutting is an important part of Chinese paper cutting. It is known for its different designs, simplistic but graceful shapes, finely cut lines and unique skills. Zhang Fanglin is a leading figure in the Nanjing-style paper cutting. Zhang was born in a paper-cutting family. He is the fourth generation to continue the family's paper-cutting skills. Taught by his father, he began to learn paper cutting in his childhood. In 1963 when he was only 14 years old, he started his artistic career in a local folk handicraft factory. Over the past decades, Zhang has created many works and developed excellent skills. In 1985, Zhang was admitted into Nanjing Municipal Fine Arts Company, creating and designing paper cuts. Throughout his artistic career, Zhang has absorbed characteristics and elements of various styles of paper cutting and created a large number of creative paper-cutting works. Thanks to his great contributions, he won many national prizes and was awarded the title of "National Master Artist in Handicraft Art". As a leading figure, Zhang Fanglin has been invited to more than 30 countries and regions around the world, showcasing his paper-cutting skills. In the 2010 Shanghai World Expo, Zhang showcased his new creations of gold foil-embedded paper cutting works.
Question: What is the passage mainly about?
Options: (A) Chinese paper cutting. (B) Nanjing-style paper cutting. (C) A paper cutting family. (D) A paper cutting artist.
Solution: D