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.

Ex Input:
Article: Heather Jack and her family, including her two children, usually spend the Christmas holidays preparing a feast--for others to eat. Last Christmas Eve, they went to a house in the neighborhood and prepared a dinner for an elderly woman and her son, who has muscular dystrophy . They stayed for an hour and chatted before heading home to prepare for a visit from Santa . "I think it is that kind of direct experience that many find so meaningful," says Heather, president and founder of The Volunteer Family, a Boston-based organization dedicated to matching families with volunteer opportunities, both during the holidays and year-round. "It's a great way for parents to involve the kids." In a holiday season that stretches from before Thanksgiving to just after the New Year, it's nice to hear stories about people with their children giving instead of receiving. Last December Gary and Debra Danoff and their two teenage sons drove to the Washington, D. C. Jewish Community Center(JCC) and spent Christmas morning in the Center's kitchen preparing a feast for homeless shelters. By choosing to prepare meals for the homeless, the Danoffs bring together a belief in community service with their love of cooking, "It feels good to prepare food with our kids for other people at Christmas," says Gary. "We want them to know that many people don't have the ability to go to the supermarket and pick the foods they want to eat and pay for them." The Danoffs were in good company. Across the city, at least 1000 volunteers with their children went across the region to provide food to the poor people as part of the D. C. JCC's annual "December 25th Day of Service", now in its 22nd year.
Question: The Heathers did all the following things except_last Christmas Eve.
Options: (A) preparing a dinner for a poor family (B) chatting with the elderly mother and her disabled son (C) making preparations for their own Christmas festival (D) visiting one of their good friends in other district

Ex Output:
D

Ex Input:
Article: How men first learned to invent words is unknown, in other words, the origin of language is a mystery. All we really know is that men, unlike animals, somehow invented certain sounds to express thoughts and feelings, actions and things, so that they could communicate with each other; and that later they agreed upon certain signs, called letters, which could be combined to represent those sounds and which could be written down. Those sounds, whether spoken, or written in letters, we call words. The power of words, then, lies in their association--the thing they bring up before our minds. Words become filled with meaning for us by experience; and the longer we live, the more certain words recall to us the glad and the sad events of our past; and the more we read and learn, the more the number of words that mean something to us increase. Great writers are those who not only have great thoughts but also express these thoughts in words which appeal powerfully to our minds and emotions. This charming and telling use of words is what we call literary style. Above all, the real poet is a master of words. He can _ his meaning in words which sing like music and which by their position and association can move men to tears. We should, therefore, learn to choose our words carefully and use them accurately, or they make our speech silly and impolite.
Question: Where does the real power of the words come from?
Options: (A) From the words themselves. (B) From their characteristics. (C) From their curiosity. (D) From their association.

Ex Output:
D

Ex Input:
Article: Every year there are changes in climate in different parts of the world.Some of these changes are due to natural causes.However,some climate changes are caused by air pollution and these changes may increase. If the pollution affects the level of carbon dioxide in the atmosphere,the results are likely to be serious.There is only a small part of carbon dioxide in the atmosphere.But it has an important function in keeping the balance between radiation from the sun entering the atmosphere and radiation leaving the Earth.Some of the radiation is absorbed by the Earth and some is radiated back into the atmosphere.The carbon dioxide in the atmosphere prevents some of the radiation from leaving the atmosphere.Thus the heat remains in the atmosphere and carbon dioxide helps to prevent the temperature of the Earth from falling. If the proportion of carbon dioxide in the atmosphere is increased as a result of air pollution,the temperature of the atmosphere may rise.This might cause the ice in the North and South to melt.If this happened,the sea level could rise and parts of the Earth would be flooded.This is not quite likely but the possibility exists. There is also a fairly strong possibility that the dust level in the atmosphere will rise as a result of industrial pollution.This dust pollution will reflect sunlight back onto space.If this happens,less sunlight will reach the Earth and the temperature will fall. Another danger comes from the destruction of the Earth's vegetation such as the forest of Brazil,which is being cleared away for farmland and cities.Trees use carbon dioxide and their destruction may upset the balance of carbon dioxide in the atmosphere.
Question: The main purpose of the passage is to tell us that _ .
Options: (A) the climate of the earth is always changing (B) air pollution has greatly affected the climate of the world (C) carbon dioxide has something to do with climate changes (D) the climate of the world is subjected to dangers from air pollution

Ex Output:
D