Given the task definition, example input & output, solve the new input case.
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
Output: B
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 case for you: Article: Most people don't notice I'm polite, which is the point. I am big and look less energetic. Still, every year or so, someone takes me aside and says, "You actually are polite, aren't you?" I'm always thrilled. They noticed. That's the thing. Actually, when we talk about politeness, we usually think of please; thank you; I like your hat; etc. All we need to do is to hear, not to notice. When I was in high school, I read etiquette manuals . No one noticed my politeness except for one kid. He yelled at me about _ . "It's strange that you are always so polite," he said. I took that as praise and made a note to hide my politeness further. Real politeness, I believed, was invisible . It adapted itself to the situation. Politeness leaves door open. I've met so many people whom, if I had trusted my first impressions, I would never have wanted to meet again. Yet many of them are now great friends. One of those people is my wife. On our first date, she told me in detail that she had an operation to remove a cyst from her body. Of course, it killed the chemistry. But when I walked her home, I told her I'd had a great time. We talked a little after that. I kept everything pleasant and brief. Much later, I learned that she'd been having a very bad day in a very bad year. People silently suffer from all kinds of terrible things. The good thing about politeness is you can regard these people exactly the same and wait to see what happens. You don't have to have an opinion. You don't need to make a judgment. Last week, my two-year-old son, Abraham met a foreign woman in the playground. Out of curiosity, I suppose, he asked, "What's your name?" The woman told him. Then he put out his little hand and said, "Nice to meet you!" Everyone laughed and he smiled. He shared with his firmest handshake, like I taught him.
Question: Why do many people think the author is impolite?
Options: (A) Because he doesn't look polite. (B) Because he seldom says polite words. (C) Because he doesn't listen to others politely. (D) Because he doesn't behave politely towards strangers.
Output:
A