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 input: 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 output: 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.
Q: Article: People say that a mother's love knows no boundaries. This is true when it comes to my mother. She has given up many things so that my sisters and I could live a better life. My mother comes from a large family and her parents died when she was quite young. She dropped out of school when she was fifteen because no one could afford to pay her studies. At the age of 19, she married my father and when they had my sisters and I, they moved to the United States so that we could have a better life. My parents did not know English but somehow they communicated with other people. My mother stayed at home and raised us while my father was working. There were so many dangerous incidents that happened where we lived that my mother finally decided that we all moved to Texas when I was seven. My mother has worked so hard to give us everything. She always tells us that all she wants is for us to be happy. As the saying goes, "You don't appreciate something until it's gone." Well, I finally had a chance to experience it. My mother went to Mexico this winter because she needed to have an operation. For the first time in my life, my mother was not there to hold and comfort me. Those two weeks when she was away made me realize how much I love her. All she has done for me is incredible. When I suffer she suffers with me. I have to show her how much I care about her. She means the world to me.
Question: The writer didn't realize that he loves his mother very much until _ .
Options: (A) they moved to Texas (B) his mother told them all she wanted was for them to be happy (C) his mother left home for an operation (D) his mother died
A:
C