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.

Input: Consider Input: 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

Output: B

Input: Consider Input: Article: Winter begins in the north on December 22nd. People and animals have been doing what they always do to prepare for the colder months. Squirrels , for example, have been busy gathering nuts from trees. Well, scientists have been busy gathering information about what the squirrels do with the food they collect. They examined differences between red squirrels and gray squirrels in the American state of Indiana. The scientists wanted to know how these differences could affect the growth of black walnut trees. The black walnut is the nut of choice for both kinds of squirrels. The black walnut tree is also a central part of some hardwood forests. Rob Swihart of Purdue University did the study with Jake Goheen, a former Purdue student now at the University of New Mexico. The two researchers estimate that several times as many walnuts grow when gathered by gray squirrels as compared to red squirrels. Gray squirrels and red squirrels do not store nuts and seeds in the same way. Gray squirrels bury nuts one at a time in a number of places. But they seldom remember where they buried every nut. So some nuts remain in the ground. Conditions are right for them to develop and grow the following spring. Red squirrels, however, store large groups of nuts above ground. Professor Swihart calls " _ ". Gray squirrels are native to Indiana. But Professor Swihart says their numbers began to decrease as more forests were cut for agriculture. Red squirrels began to spread through the state during the past century. The researchers say red squirrels are native to forests that stay green all year, unlike walnut trees. They say the cleaning of forest land for agriculture has helped red squirrels invade Indiana. Jake Goheen calls them a sign of an environmental problem more than a cause.
Question: The study done by Rob Swihart and Jake Goheen is to _ .
Options: (A) find out the living conditions for squirrels (B) learn squirrels' influence on black walnut trees (C) do something to get rid of squirrels (D) save the forests in the American state of Indiana

Output: B

Input: Consider Input: Article: A store that sells husbands has just opened in Ottawa where a woman may go to choose a husband from many men. The store is comprised of 6 floors and the men increase in positive attributes(,)as the shopper goes up the flights. There is, however, a catch . As you open the door to any floor you may choose a man from that floor, but if you go up a floor, you cannot go back down except to exit the building. So a woman goes to the shopping center to find a husband. On the first floor the sign on the door reads: Floor 1--These men have jobs. The woman reads the sign and says to herself, "Well, that's better than my last boyfriend, but I wonder what's further up?" So up she goes. The second floor sign reads: Floor 2--These men have jobs and love kids. The woman remarks to herself, "That's great, but I wonder what's further up?" And up she goes again. The third floor sign reads: Floor 3--These men have jobs, love kids and are extremely good-looking. "Hmm, better." The fourth floor sign reads: Floor 4--These men have jobs, love kids, are extremely good-looking and help with the housework. "Wow!" exclaims the woman, "Very tempting. But, there must be more, further up!" And again she heads up another flight. The fifth floor sign reads: Floor 5--These men have jobs, love kids, are extremely good-looking, help with the housework and have a strong romantic character. "Oh, mercy me! But just think...what must be awaiting me further on?" So up to the sixth floor she goes. The sixth floor sign reads: Floor 6 -You are visitor 3, 456, 789,012 to this floor. There are no men on this floor. Thank you for shopping Husband Mart and have a nice day.
Question: Women tend to go up the floor until they reach the top floor because _ .
Options: (A) they think the husbands downstairs are not suitable (B) they are sure that the best husbands are on the top floor (C) they know the catch very well (D) they think even better husbands may be upstairs
Output: D