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: One Saturday morning Ann was going on business. Before starting, she took her son Sam to her friends, Bill and Kate, and asked them to look after him for the day. Sam, an independent boy of six years old, had black hair and was wearing a pair of jeans and a bright yellow shirt. At eleven o'clock Bill took Sam into town. Sam walked along behind Bill, looking at the windows of all the shops they passed. After lunch they went to the park and walked about. The whole place was very crowded. Bill stopped to buy some chocolate. When he turned round to give some to Sam, the boy wasn't there. Bill ran round calling Sam, but he couldn't find him. About an hour later, just in front of a shop, he saw the black hair, the pair of jeans and the bright yellow shirt. The boy looked as if he was waiting for someone to come out of the shop. Bill ran across the road, took the boy by the hand and hurried off, as it was quite late. The boy began to cry and pull hard, but Bill, who didn't know much about children, couldn't understand a word the boy was saying. All the boy made was a lot of noise. When they got home at last, Bill went straight to the kitchen, with the boy still crying. At the door Bill stopped with an amazed look. There, sitting at the kitchen table with Kate, was a small boy with black hair, in a pair of jeans and a bright yellow shirt. 
 Question: Why did Ann take Sam to Bill and Kate? 
 Options: (A) Because Sam wanted to play with them. (B) Because Bill and Kate wanted to see Sam. (C) Because Sam's father wasn't at home. (D) Because Ann was too busy to look after Sam.
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
D