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: 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
Example output: B
Example 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.
Q: Article: As the queen prepares to celebrate her Diamond Jubilee, one of her closest s and oldest friends has been allowed to give a deep description of the family life of the royals. There have been hundreds of other books declaring to offer a quick look behind the Palace doors, but this is the first written by someone who is closely related to the royal family and has shared their lives----not only throughout the Queen's reign but also through that of her father, King George VI. The Final Curtseywas written by Her Majesty's cousin and childhood playmate, the Honorable Margaret Rhodes. It tells in detail the story of Mrs. Rhodes's relationship with the royal family over eight decades. The book, showed with delightfully informal and never-before-seen pictures, has been written with the full knowledge of the Queen, who has read and approved parts of it. Mrs. Rhodes lives on the royal farm in Windsor Great Park, in a house given to her by the Queen in 1980. She tells how it was offered out of the blue one day when she and the Queen---whose 60 years on the throne next year will be marked with many national famous people---were out riding. She suddenly turned around and said, " Could you bear to live in the suburb?" Therefore Mrs. Rhodes is now still living here. Born in 1925, the youngest daughter of the 16thLord Elphinstone and his wife Mary, the Honorable Margaret Rhodes has led an extraordinary life. She was the childhood playmate of her cousin, the Queen; she was a wartime MI6 spy; she was a lady-in-waiting to her aunt, Queen Elizabeth the Queen Mother, from 1991 until the latter's death in 2002. At the Queen's 80thbirthday in April 2006, Margaret gave an interview to the BBC in which she proved that, in her own opinion and despite several false reports, the Queen would not abdicate . Now, at the age of 86, she has written a charming autobiography that paints a first-time close portrait of the private world of the royal family. Elsewhere in the book she reveals how the Queen Mother was a fan of the TV shows Two Fat Ladies and Dad's Army. Perhaps more surprisingly, she was also a fan of the poet Edith Sitwell and the Poet Laureate Ted Hughes, who was a regular and favoured guest. Life at Birkhall, the Queen Mother's home of the edge of the Balmoral Estate, is described along with sometimes noisy dinners. Mrs. Rhodes recalls: "At the end of the meal, Queen Elizabeth would start a series of toasts. As well as 'Hooray for...' with glasses held high, there was even more of ' Down with...' with glasses almost disappearing beneath the table."
Question: Compared with other books about the royal family, what is the biggest advantage of The Final Curtsey?
Options: (A) It predicts whether the Queen will leave the Palace. (B) Its author is the Queen's cousin who knows her well. (C) Its author presents readers a really different Queen. (D) It discloses when the Queen will retire to work on the farm.
A:
B