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: Beijing plans to keep a tight rule on pollution by cutting emissions caused by industrial production and vehicles when it hosts the APEC Economic Leaders' Meeting in November. From November 3 to 12, the city will restrict the use of private vehicles based on evenand oddnumbered license plates, reducing the use of such vehicles by 35 percent, the municipal   traffic committee said on Thursday. All vehicles transporting construction waste and dangerous chemicals will be banned from the capital's roads during this period, but the restriction will not apply to buses, taxis and other vehicles such as police cars. The measures are similar to those introduced from July 20 to Sept. 20 in 2008 during the Beijing Olympic Games. "The number of passengers using public transport will increase by 3 million a day, " said Li Shaoming, deputy director of the Beijing Traffic Management Bureau. During the 10 days, 400 additional buses will be used to transport commuters to meet the increased demands. The municipal government has also drawn up eight plans to reduce industrial pollution during the AsiaPacific Economic Cooperation forum. Zhuang Zhidong, deputy director of the Beijing Municipal Environmental Protection Bureau, said, "From Nov. 3, production at some companies listed by the government will be _ for 10 days." Work will also be suspended at all construction sites and on demolition projects during this period. "More importantly, Beijing will work with its neighbors to control emissions," Zhuang said, adding that there will be regular discussion on air pollution among six governments. Neighboring authorities in Tianjin Municipality, Hebei, Shanxi and Shandong Province and the Inner Mongolia Autonomous Region will operate strict pollution control measures over the 10 days. Media reports said that from Nov. 7 to 12, employee departments, institutes and social organizations in Beijing can have a holiday, except for departments dealing with the APEC meeting and city management. 
 Question: What can we learn from the passage? 
 Options: (A) Cars can't be used in Beijing from November 3 to 12. (B) Not all the people in Beijing can have a holiday from November 7 to 12. (C) Citizens will choose buses as their only means of transport. (D) All the neighboring provinces will take the same measures.
Solution:
B