instruction:
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.
question:
Article: Mary went out at night. She never forgot the night when she met a robber many years ago. That evening, she was invited to a birthday party which lasted until two o'clock in the morning. Without company Mary walked along the quiet street. Suddenly from the shadow of a dark building a tall man with a sharp knife in his right hand ran out at her. "Good evening, lady," the man said in a low voice, "I don't think you wish to die here." "What do you want?" Mary asked. "Your earrings .Take them off!" Slowly Mary's eyes looked down. She tried to cover her necklace with the collar of her overcoat while she used the other hand to take off both of her earrings, and then she quickly threw them on the ground. "Take them and let me go." she said. The robber looked at her only feeling uncertain. He saw the girl didn't care for the earrings at all, only trying to protect the necklace. He realized the necklace would cost more. So he said, "Give me your necklace." "Oh, sir. It's not worth much. Please let me keep it." "Stop rubbish. Quick!" With shaky hands, Mary took off her necklace. As soon as the robber disappeared, she picked up her earrings and ran as fast as she could to one of her friends. The earrings cost 480 pounds and the necklace the robber had taken away cost only six pounds ten shillings.
Question: Mary never forgot that night because _ .
Options: (A) she was robbed of her necklace (B) she was robbed, but she fooled the robber (C) she had a good time at the party (D) she lost her earrings
answer:
B

question:
Article: Great British is an island that lies off the northwest coast of Europe. The nearest country is France which is 20 miles away. Great British is separated from France by the English Channel. The island is surrounded by the Atlantic Ocean, to the west, and the North Sea, to the east. It includes the main lands of England, Wales and Scotland. Scotland is in the north while Wales is in the west. Ireland, which is also an island, lies off the west coast of Great Britain. It is made up of Northern Ireland and the Irish Republic. Great Britain together with Northern Ireland forms the United Kingdom (U.K.). So the U.K. is made up of four countries. The largest of these is England which is divided into 43 countries. The capital city is London which is on the river Thames.
Question: Great Britain is separated from France by _ .
Options: (A) the North Sea (B) Suez Canal (C) English Channel (D) Thames
answer:
C

question:
Article: Thick dust rose and a large building collapsed. This was the scene in Zhu Zhou,Hunan Province on May 17. Nine people were killed and 16 injured. Things were similar in the Sichuan earthquake. Thousands of people were buried in the ruins and lost their lives. What if we could have warned them? People are always _ to find a way of preventing buildings' collapse. Better materials and technology help,but they are not a solution. Just like humans,a building has its own life cycle from "birth" to "death".If we know when a building is going to collapse,we can repair it in advance or get out of it before it falls. Now,scientists at the University of Illinois have developed a material that turns red before it breaks. The invention could be used in things like climbing ropes or bridge supports. The research was led by Nancy Sottos,a professor at the university's Beckman Institute,and Douglas Davis,a graduate research assistant. The secret behind the color--changing material is a type of molecule .A molecule is a group of atoms held together by chemical bonds. Imagine you and your friends standing in a circle,holding hands. Each person stands for one atom,your hands represent the bonds,and the entire circle represents a molecule. If one person lets go of his or her hands,the molecule changes color. The research team put the molecule into a soft material. When the researchers stretched the material,it turned bright red for a few seconds before it broke into two pieces. When they repeatedly stretched and relaxed the material,without breaking it,it only turned a little red. The major problem is that light can get rid of the red color. When the team shone bright light on the molecule,the broken bond was fixed,and the color disappeared. Scientists have yet to do more research before the color--changing molecules can be used outside the lab.
Question: What does the passage mainly introduce?
Options: (A) The collapse of a large building in Zhu Zhou, Hunan Province. (B) A type of molecule that can be put into a soft material (C) A material that turns red before it breaks. (D) A way of preventing building from collapsing.
answer:
C