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
Example solution: 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.

Problem: Article: A lot more people are about to get a chance to buy Google Glass. It's the Internet-connected eyewear that has become the hottest sale. Google will sell the "Explorer" version of Glass to any U.S. person who places an online order for the device beginning at 9am. PDT April 15. The product will cost $1,500. Google is saying how many sets of Glass will be available during the limited-time offer. This version of Glass, though, still isn't the perfect product that Google hopes to sell in stores later this year. For now, Google is still trying to recruit more people willing to serve as volunteers for its attempt to build a wearable device that features some of the same feature as a smart phone. " Our Explorers are moms, bakers, surgeons, rockers, and each new Explorer has brought a new view that is making Glass better," Google said. The device has a small screen attached above the right eye. A user can check e-mails, see Twitter post or get directions without having to use a phone. It can also take hands-free photos and video through voice-activated commands. The ability to record images so easily has raised safely concerns about drivers wearing Glass. The lawmakers have to draw up new rules forbidding use of the device in moving vehicles. Google regards Glass as a breakthrough . It will make it easier for people to surf the Internet while on the go. They also hope that the device could help police officers, firefighters, doctors and reporters do their jobs better.
Question: What is special about Google Glass?
Options: (A) People can only order it online. (B) It's cheaper than the ordinary glasses. (C) People can explore the Internet with it. (D) It doesn't contain any actual glass in the future.
Solution: C