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: Since the beginning of time, man has been interested in the moon. The Romans designed a special day to show admiration and respect to the moon. They called it "Moonday", or "Monday", as we know it today. Later, the great mind of Leonardo da Vinci studied the moon and designed a machine to carry a human to the moon. Leonardo said that one day a great machine bird would take a person to the moon and bring great honour to the home where it was born. Four and a half centuries later, Leonardo's idea was realized. Apollo II took three Americans--Collins, Aldrin, and Armstrong--to the moon. The mission   did fill the whole world with great surprise, as Leonardo had said it would. A lot of essays, articles, and books were written about man's first moon mission. But perhaps the most interesting story was one written before the event----over 100 years before.  In 1865, French author Jules Verne wrote a story about the first journey to the moon. His story was very similar to the 1969 Apollo II mission.  Verne's spacecraft also contained three men--two Americans and a Frenchman. The spacecraft was described as being almost the same size as Apollo II. The launch site in Verne's story was also in prefix = st1 /Florida. The spacecraft in Verne's story was named the "Columbiad". The Apollo II command ship was called "Columbia". His account of sending the spacecraft into the space could easily have been written about how Apollo II was sent into the space. Verne's story was the same as the actual event in several other respects. The speed of Verne's spacecraft was 36,000 feet per second; Apollo's was 35,533 feet per second. Verne's spacecraft took 97 hours to reach the moon; Apollo's time was 103 hours. Like Apollo's spacemen, Verne's spacemen took pictures of the moon's surface, relaxed on their seats, cooked with gas, and experienced weightlessness. They too came down in the Pacific and were picked up by an American warship.  What were the reasons for Jules Verne's extreme accuracy   in describing an event 100 years or more before it actually occurred? He based his writings on the law of physics and astronomy  . Nineteenth-century science and the vivid Verne's imagination gave people an unbelievably accurate preview of one of the greatest events of the 20thcentury. 
 Question: Leonardo da Vinci said that a great machine bird would   _  . 
 Options: (A) bring great honor to the moon (B) . fly toward the sun (C) explore the heavens (D) take people to the moon
Answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
D