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 Q]: 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
[EX A]: B

[EX Q]: Article: A clique(,) is a group of friends who hang out together and act in similar ways. Cliques are common feature of the teen years. Members of a clique usually have certain things in common. For example, they might all be good students. Membership in a clique is limited. Not everyone who wants to belong can join. Cliques can have a positive or negative influence. Because most teens have a strong need to belong, they want to feel that they fit into a group. Cliques can help them meet this need. Sometimes teens feel unsure of themselves, and they use a clique to gain approval of what they wear or how they act. Cliques can become harmful, however, if they pressure members to behave the same way as the group that may damage their health. Cliques may discourage members from making their own decisions, giving their own opinions, or having other friends who aren't accepted by the clique. Cliques may even pressure members to act in ways that go against their own values and beliefs, such as lying to parents or teachers. Cliques can also hurt people outside the group. For example, members might make fun of a teen who isn't in the clique. If you find yourself under this type of pressure from a clique, here are some actions you can take to improve your situation. * Suggest other activities. Offer ideas that don't involve hurting others or putting anyone at risk. * Find new friends. If staying in the clique is becoming a negative experience, you will be better off with new friends.
Question: Why do teens want to be a member of a clique?
Options: (A) Because it is popular with teens. (B) Because it meets teens' need of belonging. (C) Because it is where teens can be themselves. (D) Because it provides an opportunity for them to be away from their parents.
[EX A]: B

[EX Q]: Article: Schools have been blamed for giving kids access to soda in vending machines . But new data suggest that school soft drink sales may not be an important factor in how much soda kids drink. In the current issue of The Journal of Nutrition Education and Behavior, researchers compared soda consumption among nearly 500 students inprefix = st1 /Mainewho attended seven schools over two school years. Four of the schools cut back on soft drink availability at the schools, while three of the schools made no changes. All the students were drinking less soda by the end of the study period, but there were no meaningful differences in overall soft drink consumption among the different schools. The data suggest that limiting soft drink availability at school doesn't result in meaningful changes in drink consumption patterns. While there were no changes in overall soda consumption, there was a notable shift in diet soda drinking among girls. If the school cut back on soda availability, girls were less likely to drink diet soda, compared to girls in schools that made no changes. The data are the latest to suggest that schools may not play as big of a role in kids' poor eating habits as widely believed. Last year, The American Journal of Public Healthpublished a provocative study showing that childhood weight problems often get worse in the summer, when kids are out of school. Data from kindergarteners and first graders found that body mass index increased two to three times as fast in summer as during the regular school year. Minority children were especially at risk, as were children who were already overweight. Even children who were too thin and needed to gain weight appeared to have better eating habits during the school year. They actually gained more weight while in school and less in the summer. Even so, much of the focus on childhood nutrition and obesity remains in the nation's schools. Today, The Timesreported that even the school bake sale is disappearing as districts impose strict standards on the food served on school grounds.
Question: What can be learned from The Journal of Nutrition Education and Behavior?
Options: (A) Soft drink remains a problem in schools. (B) Girls tend to consume less soda at school. (C) Soft drinks may not to be blame for eating problems. (D) Vending machines are not available in all schools.
[EX A]:
C