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: Thailand's capital Bangkok is both attractive and wonderful, a city of glass towers and concrete buildings crowded with nearly 10 million people. The ground beneath is spongy and moist. Imagine a brick resting on top of a birthday cake. That's Bangkok-and it's sinking into the Earth at an alarming rate. Thailand's disaster specialists have been warning of this coming disaster for years. One expert has said he's worried about Bangkok resembling Atlantis. Another previously told Global post that the city will be under five feet of water by 2030. The latest estimates suggest that Bangkok is now sinking as fast as two centimeters per year in parts of the city. The predictions for 2100 are even more terrible. By then , Bangkok will be fully submerged and unlivable. Like global warming, which will accelerate the city's submersion by raising the sea leavel, Bangkok's sinking problems are repeatedly _ But the monsoon season, currently underway, tends to bring this crisis to mind. A nasty storm can suddenly turn Bangkok's streets into gushing streams. Sewers overflow, taxis move through dirty water and, occasionally, kids can pick up displaced fish. Anond Snidvongs, director of the Southeast Asia Regional Research Center, predicts the city's outskirts will be the first to go. Parts of the shoreline ebyong Bangkok are already liend with pumps that make noises and help to transform invading seawater. They don't always work. During heavy rains, salt water flows in the streets of the city. Bangkok is swallowed up a little more each day. Experts tend to offer two solutions. The first is to pu up a massive seawall that could cost nearly $3 billion-nearly 1 percent of Thailand's current GDP. The second option is to give up entirely and move the capital to higher ground.
Question: Why is Bangkok sinking into the earth?
Options: (A) Its buildings are too heavy. (B) It has an overlarge population. (C) Its underground is too loose. (D) It is resting on top of a lake.
Solution: C