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: My son Paul got a job in a large chain of guitar stores. It was the first time for him to do such a job. The pay was based on a small salary and his sales. They offered him some training on how to get close to a customer, introduce the product and make the sale. However, he wasn't doing well. He was very _ . One morning Paul said to me, "Mum, you used to be a sales trainer. Can you tell me why I'm not doing well?" I said, "The key is that you must love the people you are selling your product to, not count the money you will make in your mind. Do what is best for them even though they are just buying something small or a cheap guitar." He promised he would try it. After some time, his sales began to increase. He became the top salesman in the store and his salary was increased. Within six months, he was one of the top ten salespeople in the whole chains of guitar stores around the country. His company held a big party to honor the top ten salespeople. New cars, great hotels and delicious dinners were the prizes. Paul was of course included. After the dinner, the boss of the company asked, "Paul, how did you make it?" Paul answered, " I don't want to tell you. You won't believe me." "Of course I'll believe you. Tell me." "I started loving the people who came in," Paul told him. The boss replied, "Okay Paul, now tell me how you REALLY make it."
Question: His mother suggested that Paul should _ .
Options: (A) always introduce the cheap guitars to customers (B) show love and respect to his customers (C) work out how much he would make before each sale (D) learn from the top ten salespeople in his company
Output:
B