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.

Example 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
Example Output: B

Example Input: Article: Of all the areas of learning the most important is the development of attitudes. Emotional reactions as well as logical thought processes affect the behavior of most people. "The burnt child fears the fire" is one instance; another is the rise of figures like Hitler. Both these examples point up the fact that attitudes come from experience. In the one case the experience was direct and impressive; in the other it was indirect and gradual. The classroom teacher in the elementary school is in strategic position to influence attitudes. This is true partly because children acquire attitudes from those adults whose word they respect. Another reason it is true is that pupils often search somewhat deeply into a subject in school that has only been touched upon at home or has possibly never occurred to them before. To a child who has previously acquire little knowledge of Mexico, his teacher's method of handling such a unit would greatly affect his attitude toward Mexicans. The teacher can develop proper attitudes through social studies, science matters, the very atmosphere of the classroom, etc. However, when children come to school with undesirable attitudes, it is unwise to attempt to change their feelings by criticizing them. The teacher can achieve the proper effect by helping them obtain constructive experience. To illustrate, first-grade pupils, afraid of policemen will probably change their attitudes after a classroom talk with the neighborhood officer in which he explains how he protects them. In the same way, a class of older children can develop attitudes through discussion, research, outside reading and all-day trips. Finally, a teacher must constantly evaluate her own attitudes, because her influence can be harmful she has personal prejudices. This is especially true in respect to controversial issues and questions of which children should be encouraged to reach their own decisions as result of objective analysis of all the facts.
Question: The author uses the phrase "the burnt child fears the fire" in order to _ .
Options: (A) stress the importance of keeping child from the fire (B) exemplify the opinion that attitudes come from experience (C) illustrate the important role of attitudes towards study in the early childhood (D) none of the above
Example Output: B

Example Input: Article: Carnival is an explosion of joy. It is a festival that mixes creativity, color1s, sounds, costumes and so on. The carnival in Rio starts on Saturday, and ends on Tuesday. Little need to be said about the carnival in Rio. Every year, Rio hosts the world's largest carnival. The samba school parades are world-famous. The festival begins officially when the city's mayor hands over a giant silver and gold key to the Fat King (King Momo) . Then people dance, sing, party and have tons of fun. There are many parties that take lace before, during and after the carnival all night and all day. Samba schools are not teaching institutions as their names suggests and do not offer samba classes.There are over 70 samba schools in Rio de Janeiro and they all parade during the 4-day celebration.They are organized into six competitive leagues.They are the Special Group A,B,C,Dand E.The first three groups parade in the Sambodromo.The other groups parade on the streets and are free to watch and join in.The biggest and most popular 12 leading schools are from the Special Group.They create a pageant with 3,000 to 5,000 people competing in the Samba Parade in the Sambodromo on Carnival Sunday and Monday. Balls takes place every night throughout the week, together with a variety of costume contests. One of the most frequent questions we hear is " What is the date of the carnival this year?" Well, believe it or not , it is not an easy question to answer. You have to be part astrologer , part mathematician, and part priest.
Question: The carnival in Rio will begin officially when _
Options: (A) the mayor announces officially (B) King Momo appears (C) King Momo takes over the key of the city. (D) the mayor comes with the King Momo.
Example Output:
C