Given the task definition, example input & output, solve the new input case.
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
Output: B
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.

New input case for you: Article: Greece is one of the most beautiful countries of the world.Millions of tourist visit this place every year.In Greece the bus is the most convenient and preferred means of traveling.There are intercity buses operated by KTEL that interconnect various cities of Greece,!! and there are international buses operated by OSE that connect Greece to other European cities. Every tourist must visit Greece at least once in life.This country is really a vacation heaven.It is the perfect blend of history and art with adventure and romance.You car| dive into deep[ blue waters, climb up the mountains or enjoy ancient architecture and history. Buses in Greece are cheap and very comfortable.All bus stations display schedules of buses on every route.Conductors and drivers are very polite and helpful.Travelers never face any rouble locating and boarding buses to their destinations.Tourists can always ask the conductor to inform them about their stop, so that they can get down at the right stop.Everyone here is more than happy to help tourists. Athens, me capital of Greece, has three bus terminals .Buses to different parts of Greece leave from different terminals.Air-conditioned express buses also operate between major cities.They are faster and more comfortable than other buses.Tourists can choose guided Greece bus ^our.These tours are the perfect way of exploring this great country. | Buses in Greece are also a great way of saving _ on the journey.The long-distance bus system is very cheap.Buses save a lot of money to cover long distances, cheaper than taxis or cars. They are also the best means of interacting with local people.You can sit next to a native of Greece and get some information about the place.
Question: The company KTEL offers bus services _ .
Options: (A) to different cities in Greece (B) from Greece to other countries (C) to tourist attractions in Greece (D) from Greece to its bordering countries
Output:
A