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.

Let me give you an 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
The answer to this example can be: B
Here is why: 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.

OK. solve this:
Article: A Bite of China, made by CCTV's Documentary Channel, sparked discussion not only on Chinese food, but also on locally made documentary programs. When you think of documentaries, you may think of them as long, boring programs. But documentaries can be wonderful and bring stories from the real world into our homes. With fascinating footage and stories, documentaries encourage us to think about interesting issues we wouldn't necessarily know about. So, what makes a good documentary, and what should we pay attention to when we watch one? Here, we offer a few easy strategies to help you get the most out of watching documentaries. Pay attention to the themes While watching a documentary, keep your eyes and ears peeled for the themes people talk about and what ideas they focus on. Is it meant to be informative or raise a certain emotional response? Think critically Listen to what the people in the documentary are saying and ask yourself the following questions: If you were debating with someone or introducing a new concept, would you say the things the people in the documentary are saying? Do the arguments make sense? Check the sources If you're sitting at the computer and can't think of anything to do, why not look up the points the documentary made and see if they are accurate? You could even read more about what is presented in the documentary. Who are the creators? The creators or financial backers of a film will usually be involved with how the subject matter is presented. For instance, as the documentary 2016: Obama's America was directed in large part by a conservative writer, it's not surprising that it's critical of President Obama from the beginning.
Question: Which of the following is the most proper to describe documentaries?
Options: (A) non-fictional (B) controversial (C) subjective (D) thoughtful
Answer:
A