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.
One example: Article: Homework can put you in a bad mood , and that might actually be a good thing. Researchers from the University of Plymouth in England doubted whether mood might affect the way kids learn. To find out the answer, they did two experiments with children. The first experiment tested 30 kids. Someshapes were hidden inside a different, larger picture. The kids had to find the small shapes while sitting in a room with either cheerful or sad music playing in the background. To test their mood, the scientists asked the kids to point to one of five faces, from happy to sad. Children who listened to cheerful music tended to point to the smiley faces while the others pointed to the unhappy ones. The researchers found that sad kids took at least a second less to find the small shapes. They also found an average of three or four more shapes. In the second experiment, 61 children watched one of two scenes from a film. One scene was happy, and the other was sad. Just like in the first experiment, kids who saw the sad scene acted better compared to the others. The researchers guessed that feeling down makes people more likely to focus on a problem or difficult situation. Not all scientists agree with them, however. Other studies argued that maybe, that cheerful music in the first experiment distracted kids from finding shapes. While scientists work on finding out the answers, it still might be wise to choose when to do your tasks according to your mood. After eating a delicious ice cream, for example, write an essay. 
 Question: Researchers did experiments on kids in order to find out _ . 
 Options: (A) how they really feel when they are learning (B) whether mood affects their learning ability (C) what methods are easy for kids to learn (D) the relationship between sadness and happiness
Solution is here: B
Explanation: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment. So, B is the correct answer.

Now, solve this: Article: Americans often say that there are only two things a person can be sure of:death and taxes.Many people feel that the United States has the worst taxes in the world. Taxes are the money that people pay to support their government.There are generally three levels of government in the United States:federal,state,and city;therefore,there are three types of taxes. Salaried people who can earn more than four to five thousand dollars per year must pay a certain part.It depends on their salaries.The federal government has a two-level income tax:that is,15 or 28 percent.$17 850 is the cut off.The tax rate is 15 percent below $17 850 and 28 percent above. The second tax is for the state government:New York,California,or any of the other forty-eight states.Some states have an income tax similar to that of the federal government.Of course,the percentage for the state tax is lower.Other states have a sales tax,which is a percentage charged to any item which people buy in the state.Some states use income tax and sales tax to raise their revenues(=annual income). The third tax is for the city.This tax comes in two forms:property tax(people who own a home have to pay taxes on it) and excise tax ,which is collected on vehicles in a city.The cities use this money for education,police,public works,etc. Since Americans pay such high taxes,they often feel that they are working one day each week just to pay their taxes.People always complain about taxes.They often say that the government misuses their tax dollars.They all believe that taxes are too high in this country. 
 Question: In the United States,taxes are collected to provide revenues for    . 
 Options: (A) the federal government (B) the state government (C) the city government (D) the three levels of government
Solution:
D