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.
One 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
Solution is here: B
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.

Now, solve this: Article: What is politeness? This sounds like a simple question. In daily life, we often make judgments about what is polite and what is not polite. For example, to offer your seat to the elderly on a bus is considered polite behavior, and to interrupt when someone is talking is considered impolite; to greet someone the first time you meet him in the morning is polite and to stand up to reach for the dish you want at a dinner table is impolite. So politeness can first of all be regarded as a phenomenon, an observable social phenomenon. What I would like to propose is that as an observable social phenomenon, politeness is something superficial, but to account for what is understood at the surface, we should dig into the depth where different cultural values are rooted. When being complimented  , an English-speaking person would readily accept the compliment by saying something like "Thank you" to show his appreciation of the praise, but a Chinese speaker would try to deny the truth of the compliment. They both think they are behaving properly. Yet neither of them would think the other is being polite. The English speaker is being polite to the extent that by accepting and showing appreciation of the compliment, and he avoids hurting the positive face of the person who makes it; the Chinese speaker is showing modesty by  _ himself, ignoring the fact of the compliment paid to him. As has been mentioned, self-denigration has been at the core of the Chinese understanding of politeness for over two thousand years. The Chinese, in order to show modesty, will go to such lengths as to underrate what he himself has achieved and deny the truth of a complimentary remark. 
 Question: In the author's opinion, the nature of politeness lies in   _  . 
 Options: (A) something superficial (B) what is understood at the surface (C) different cultural values (D) the root of different thoughts
Solution:
C