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: Gu Changwei was the first Chinese cinematographer to be nominated for an Oscar, he is regarded by Zhang Yimou as the best cinematographer in China. Gu was behind the camera for many of Zhang Yimou's famous films including the one that rocketed Zhang to fame: "Red Sorghum ". And now this master of the visual has taken on his first directing role with the film "Peacock". So Gu Changwei has come out from behind the camera into the spotlight . Gu Changwei is very serious about his directing "Peacock". To get the authentic atmosphere, Gu took his film crew to the city of Anyang in central China's Henan province where the story takes place, to shoot the film. He chose all new actors because he didn't want "star" appeal to weaken the power of the story, and he also had his actors trained in the local dialect. For this film Gu has been able to get out from behind the camera to manage every aspect of the film, and to realize his own ideals in movie-making. "Peacock" is about the life of an average family in a small town in Henan province in the late 70s and early 80s. Gu chose this story for his first movie because he grew up during this same period and it struck a chord with him. "Peacock" wrapped up production in June, 2004. It's aimed at the foreign film market and will be entered in February's Berlin Film Festival, and released in China at the same time. But at the end of last October, Gu took "Peacock" to his Alma Mater, the Beijing Film Academy, one of the most famous film colleges in China, to hold a preview. The film was warmly received by both teachers and students.
Question: Gu didn't employ "stars" in his film because _ .
Options: (A) stars usually stick to their own acting styles (B) the stars may not be able to speak the local dialect (C) the stars may share the audience's attention with the story (D) it was not easy for him, a fresh hand, to invite stars to join him
A:
C