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: Kitty is a little black-and-brown Australian dog. It's not a particularly bright dog. While Dad can make my sister and me afraid just by the tone of his voice, I have never heard him raise his voice at Kitty. In fact, one look from Kitty at the biscuit tin is enough to send my dad flying to get him a snack. Whenever we protest about the unfair treatment, Dad has a sorry smile on his face. It's become a long-standing family joke that Kitty is the closest thing to a son Dad will ever have. Then, five years ago, our lives were turned upside down when Dad suffered two major strokes within a month. For four long months, mentally he was non-responsive. We had to take turns standing by his bedside to protect him. We were exhausted after every "shift" but grateful that he was still alive. As the months went by, I couldn't help but talk about Kitty constantly, often hoping that Dad could show some awareness of what I said. Then one day, without even realizing it, I blurted out , "Is Kitty a tiger?" Dad began to smile. It was the first sign in four months that Dad had showed any awareness of what I said. Seeing this, the whole family felt a huge weight lift from our shoulders. Over the next nine months, Dad had to learn all the basic things we take for granted. Dad, who was an independent man with a successful career before all this happened, found it increasingly frustrating . The only thing that ever brought a smile to his face was talk of Kitty. When we massaged Dad's arms and legs to prevent his muscles from weakening, I would always say: "Now all you need is Kitty to give you a 'lick-lick' foot massage!" No matter how many times I repeated this comment, the whole family would laugh.
Question: How did the author feel after seeing Dad's smiling to her talk of Kitty?
Options: (A) Doubtful. (B) Angry. (C) Happy. (D) Regretful.
A:
C