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: Summer cools down in August when the city features a lot of jazz to send excitement to any music fan. Beginning August 28, the city hosts a week of jazz performances in a variety of places. This year's annual Jazz Festival in Grant Park will offer a "tribute to New Orleans" with performers from the city, honoring the birthplace of Jazz. Jazz fans who want to be part of the week-long celebration can start with a free concert at Millennium Park's famous Pritzker Pavilion on Monday, August 28 at 6:30 pm.     * Other events will include:     Tuesday, August 29 -- the Jazz Institute of Chicago presents the Fourth Annual Gala Concert.    Wednesday, August 30 -- Heat up Wednesday night with a ride to the best jazz hot spots and learn a bit of history of the genre   with the Jazz Institute's Jazz Club Tour, which starts at 6 pm until midnight. For one low price, visit more than a dozen Jazz Clubs. The tour covers nearly every inch of Chicago.     *The Chicago Jazz Festival Officially opens with a ticketed performance at the Symphony Center on Thursday, August 31. Then, the festival moves to Grant Park on Friday, September 1, for three days of free music on three stages. The event opens daily at 11 am. * Performance hours are: Jazz on Jackson Stage 12 pm -- 4:30 pm. Jazz & Heritage Family Stage 12:30 pm -- 4:30 pm. Petrillo Music Shell 5 pm -- 9:30 pm.     * In addition to the music, the Chicago Jazz Festival features an art fair lying in the rose garden just south of Jackson. The fair offers all kinds of handmade crafts and artwork. 
 Question: What is special for the Chicago Jazz Festival this year? 
 Options: (A) Jazz on Jackson Stage. (B) Jazz & Heritage Family Stage. (C) Tribute to New Orleans. (D) Jazz Club Tour.
Solution:
C