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.

[Q]: Article: Long long ago, there was a man who was good at shooting arrows.He asked the king to declare him as the greatest archer of the country.The king was about to do so when an old servant of the king said,"Wait,sir.I know an old man who lives in the forest.He is a much greater archer.Let this young man go to him and learn from him for at least three years." The man could not believe what the servant said,but he went and found the old man and he was! For three years he learned from him.Then one day,when he thought he had learned everything,the thought arose in him:"If I kill this old man,then I will be the greatest archer." The old man had gone to cut wood and he was coming back carrying wood on his shoulder.The young man hid behind a tree,waiting to kill him.He shot an arrow.The old man took a small piece of wood and threw it.It struck the arrow and the arrow turned back and wounded the young man very deeply.The old man came,took out the arrow and said. "I knew that some day or other you were going to do this.That's why I have not taught you this secret.There is no need to kill me.My Master is still alive,and I'm nothing before him.You must be with him for at least thirty years.And he is very old,so go fast! Find the old man!"
Question: The young archer wanted to kill the old man because _ .
Options: (A) he could then become the greatest archer (B) he had nothing more to learn from him (C) the old man refused to teach him everything (D) the king's old servant ordered him to do SO
[A]: A

[Q]: Article: Harry is eighteen now. He studies in a middle school.His parents like him very much and hope he can become a famous man. So they often tell him to study hard and they do almost everything for him. They wakes him up at six in the morning, after breakfast his father takes him to school in a car and in the afternoon, as soon as the young man comes back, the supper is ready. Of course, he never washes his clothes or goes to buy anything in the shops. Once Harry's father was sent to London on business. He would stay there for half a year. Upon leaving, he told his wife to take good care of their son. The woman had to get up eatlier and did all that her husband did before. And two months later she was so tired that she was ill in bed. Now the young man got into trouble. He couldn't do any housework. He had to do as his mother told him. He didn't even know where to get on the bus! One day Harry's mother found his shoes were worn out and told him to buy a pair in the shop. But he didn't know how to choose The woman had a sigh and give him a shoe patten and told him to buy a pair of.shoes himself. With a policeman's help, Harry found a shop. The shopkeeper was friendly to him. The man brought a lot of shoes and asked him to choose. When he was trying on a pair, suddenly he remembered something and took them off. The man was surprised and asked, "What's the matter, young man?" "I'm sorry. I've left the shoe pattern at home!"
Question: _ always does some housework in the morning
Options: (A) Harry's father (B) Harry's mother (C) Harry (D) Nobody
[A]: A

[Q]: Article: Some colors people see late at night could cause signs of clinical depression . That was the finding of a study that builds on earlier study findings. They show that individuals who live or work in low levels of light overnight can develop clinical depression. Doctors use the word "clinical depression" to describe severe form of depression. Signs may include loss of interest or pleasure in most activities, low energy levels and thoughts of death or suicide. In the new study, American investigators designed an experiment that exposed hamsters to different colors. The researchers chose hamsters because they are nocturnal, which means they sleep during the day and are active at night. The animals were separated into four groups. One group of hamsters was kept in the dark during their night-time period. Another group was placed in front of a blue light, a third group slept in front of a white light, while a fourth was put in front of a red light. After four weeks, the researchers noted how much sugary water the hamsters drank. They found that the most depressed animals drank the least amount of water. Randy Nelson heads the Department of Neuroscience at Ohio State University. He says animals that slept in blue and white light appeared to be the most depressed. "What we saw is that these animals didn't show any sleep uneasiness at all but they did mess up biological clock genes and they did show depressive sign while if they were in the dim red light, they did not." Randy Nelson notes that photosensitive cells in the eyes have little to do with eyesight. He says these cells send signals to the area of the brain that controls what has been called the natural sleep-wake cycle. He says there's a lot of blue in white light. This explains why the blue light and white light hamsters appear to be more depressed than the hamsters seeing red light or darkness.
Question: Researchers use hamsters in the experiment because _ .
Options: (A) they are similar to humans in dealing with colors (B) they are easy to observe and study (C) they are sensitive to colors like human beings (D) they are active at night and sleep during the day
[A]:
D