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: Some people make art with paint, and others use pencil or clay. But Italian artist Maurizio Savini prefers to use bright pink gum--after it has been chewed. Savini makes huge sculptures of bears and even people out of used chewing gum. Each sculpture requires thousands of pieces of gum. "I like to use chewing gum because it seemed to me a material that can be used in many ways compared with those used by the conventional arts such as painting," Savini says. How does he do it? The process is a lot like working with clay. "I work the chewing gum when it is warm and shape it with a knife," says Savini. Then, he puts a chemical onto each gum sculpture to make the gum stay in place. Savini's sticky art has been shown in cities like London, Paris, and Rome, where he lives today. Savini isn't the only artist to work with gum. His pink sculptures have inspired artists all over the world to get creative with the sticky matter. London artist Ben Wilson paints small paintings onto flat pieces of chewed gum he finds stuck to streets and sidewalks. In Canada, Jason Kronenwald uses different colored gum to make portraits of famous people. Kronenwald seldom chews gum himself. Instead, his friends help chew gum for him while he's working. "At times it can make me _ , but I just pay attention to the colors I need and get the sculpture going," he says. In America, Jamie Marraccini's art depends on color, so he tests different kinds of gum before using them. To find out what color the chewed gum will become once hardened, he lets it age for up to six months. "I've created 30 works totaling more than 35,000 pieces of gum," says Marraccini. That's a lot of gum! So think twice the next time you throw away a wad of gum. Maybe what seems like trash could actually be the beginning of a great piece of art.
Question: Marraccini stores the gum for six months in order to _ .
Options: (A) judge how hard it will be (B) know whether it is still sweet (C) examine what chemicals it contains (D) see what color it will become

Output: D

Input: Consider Input: Article: In the atmosphere, carbon dioxide acts rather like a one-way mirror or the glass in the roof of a greenhouse which allows the sun's rays to enter but prevents the heat from escaping According to a weather expert's prediction , the atmosphere will be 3degC warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate.If this warming up took place.the ice caps in the poles would begin to inch,thus raising sea level several meters and severely flooding coastal cities.Also.the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere ,possibly resulting in an alteration of the earth's chief food growing zones. In the past,concern about a man-made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet.But the weather experts are now paying more attention to West Antarctic.which may be affected by only a few degrees of warming,in other words,by a warming on the scale that will possibly take place in the next fifty years from the burning of fuels. Satellite pictures show that large areas of Antarctic ice are already disappearing.The evidence available suggests that a warming has taken place.This fits the theory that carbon dioxide warms the earth. However, most of the fuel is burnt in the northern hemisphere,where temperatures seem to be falling.Scientists conclude,therefore ,that up to now natural influences on the weather have gone beyond those caused by man.The question is:Which natural cause has most effect on the weather? One possibility is the variable behavior of the sun.Astronomers at one research station have studied the hot spots and 'cold' spots (that is, the ly less hot spots)on the sun.As the sun rotates ,every 27.5 days,it presents hotter or colder faces to the earth,and different aspects to different parts of the earth.This seems to have a considerable effect on the distribution of the earth atmospheric pressure,and consequently on wind circulation.The sun is also changeable over a long term:its heat output goes up and down in cycles,the latest trend being downward. ' Scientists are now finding shared relations between models of solar weather interactions and the actual climate over many thousands of years,including the last ice Age.The problem is that the models are predicting that the world should be entering a new Ice Age and it is not.One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia of the earth's climate.If this is right, the warming effect of carbon dioxide might thus be serving as a useful opposed balance to the sun's fading heat.
Question: It can be concluded that a concentration of carbon dioxide in the atmosphere would_.
Options: (A) mean a warming-up in the Arctic (B) raise the temperature of the earth's surface (C) prevent the sun's rays from reaching the earth's surface (D) explain the cause of great changes in the climate in the northern hemisphere

Output: B

Input: Consider Input: Article: For some reason Dodger did not want to enter London during daylight, so it was nearly eleven o'clock at night when they got near the centre. Oliver had never seen a dirtier or more miserable place. The streets in this district were narrow and muddy, and there were terrible smells everywhere. Children wandered around even at this time of night, in and out of the many shops, playing and screaming. The pubs were full of people fighting, and big, evil-looking men stood in the doorways or at dark corners. Oliver almost wanted to run away, but just then Dodger pushed open a door and pulled Oliver into a dark hall. "Who's there?" a voice cried out. "It's me," said Dodger. The faint light of a candle appeared in the hall. "Who's the other one?" "A new friend." They went up some dark and broken stairs. Oliver could hardly see where he was going, but Dodger seemed to know the way, and helped Oliver up. They entered a room with walls that were black with age and dirt. In front of the fire was a table with a candle stuck into a bottle of beer, and an old man, with a horribly ugly face and red hair, stood next to the fire cooking. He was wearing a dirty old coat and seemed to divide his attention between his cooking and a number of silk handkerchiefs, which were hanging near the fire. There were several rough beds in the room. Four or five boys, about the same age as Dodger, sat round the table, smoking and drinking like middle-aged men. They all looked up when Dodger and Oliver entered. "This is him, Fagin," Dodger said to the old man. "My friend Oliver Twist." Fagin smiled and shook Oliver's hand. Then all the young gentlemen came up to him and shook both his hands very hard, especially the hand which held his few possessions. One of the boys was particularly kind. He even put his hands in Oliver's pockets so that Oliver would not have to empty them himself when he went to bed. The boys would probably have been even more helpful, but Fagin hit them on their heads and shoulders until they left Oliver alone. "We're very glad to see you, Oliver," said Fagin. "I see you're staring at the handkerchiefs, my dear. Aren't there a lot? We've just taken them all out to wash them, that's all! Ha! Ha! Ha!" This seemed to be a joke, as the old gentleman and all his young friends gave loud shouts of laughter. Then supper began. Oliver ate his share of the food and was then given a glass of gin-and-water. Fagin told him to drink it fast. Immediately afterwards, Oliver felt himself lifted onto one of the beds and he sank into a deep sleep.
Question: Why did all the young gentlemen come up to Oliver and shake his hands very hard?
Options: (A) Because they were of the same age. (B) Because they liked Oliver at the first sight. (C) Because they were required to do so. (D) Because they wanted to steal something from Oliver.
Output: D