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.

Input: Consider Input: Article: There are many differences between British English and American English.I used to teach a course about the differences between the two.We speak English on both sides of the Atlantic Ocean but we have many differences in our common language.We have examples of the same words having very d ifferent meanings,differing spellings of the same words as well as completely different words for the same things.Here are some examples. A cookie in the US is called a biscuit in the UK.A biscuit in the US is a small cake in the UK.Crisps in the UK,are known as chips,but we British people eat a plate of chips that you call fries in the US.In the UK,a pie can be made from either meat or fruit,while in the US pies are normally made from fruit;pot pies are made from meat.Most things are measured in grams and kilograms in the US,not pounds and ounces. One very obvious difference is the side of the road we each choose to drive on.Petrol in the UK is gas in the US.The place where we fill up our cars,in the UK,is a garage;while in the US,it's a gas station.The term garage is also used as a place to store your car next to or close by your house.In the UK we call a lorry what is known as a truck in the US. An elevator in the US is called a lift here,and the first floor in the US,is calle d the ground floor here,so many visitors get off on the wrong floor in British hotels. I could continue with this. There are countless examples of differences within our one shared language.With so many differences,no wonder it's hard to understand each other well.
Question: The passage is mainly about the differences between British English and American English in _ .
Options: (A) vocabulary (B) grammar (C) sound (D) spelling

Output: A

Input: Consider Input: Article: A few years ago, I moved into a new house in Los Angeles. Soon after, a family moved in next door. It wasn't the best of times for me. I had just divorced from my second wife, and I wasn't working. I'd come home each day and sit by myself in the backyard. One night, I heard someone from the yard next door, "Tom ! How are you, Tom? " I couldn't see anybody through the trees, but I answered, "I' m good." "Good!" said the voice. "What's your name?" I asked. "Eric." Then I heard someone say, "Eric, don't bother him." "Okay!" Eric said. "Talk to you tomorrow!" Months later, on Halloween, we finally met face to face. Eric came to the door dressed like a rap star. We became friends. We'd hang out in our yards, and Eric, who was almost 17 at the time and look liked a 13-year-old, would tell me his ideas and dreams. Eric's dad, Alec Gores, is a billionaire , the head of Gores Technology Group. One day, Alec called me and said, "I know you are an actor. My son's an actor, too. And he's very good. I want you to write a movie for him. He wants to do something like True lies." That's the movie I made in 1994. His father has given Eric the great gif of confidence. He believes he can do anything he wants. He also offered to fund the movie. And that's how The Kid & I, which opens in November, began. Well, I really have to say that opportunity lies anywhere.
Question: What do we learn about the writer when he had just moved into his new house in Los Angele?
Options: (A) He often came back very late. (B) He was working in the city at that time. (C) He and his second wife had just gotten divorced. (D) He often talks with others in the backyard.

Output: C

Input: Consider Input: Article: Long ago, little attention was paid to a person's birthday. Even though everyone knew that people grew older, they had no way of correctly marking time. It wasn't until the early people learned more about how time passed that they made a note of time changes. Then they developed a calendar and began to celebrate special events such as birthdays. When birthdays first started to be celebrated during the early days, common people, especially children, hardly celebrated their birthdays. Today, birthdays are celebrated by the young and the old alike all around the world. Many countries have different customs from ours of celebrating birthdays. At the same time there are a lot of people that celebrate birthdays in quite similar ways as we do. Some of the countries are very similar to the United States, such as Austria, Denmark, Ireland, Sweden and Switzerland. Customs within countries can be affected by things like language, religion, geographic location, and economic conditions. No matter what the customs are, however, they are always followed by the majority of the people in each country. For example, not all children in the US have birthday parties, candles or birthday cakes, but most of them do. However, the reasons why we celebrate birthdays and use different symbols are very much the same to everyone. The reason why we have birthday parties goes back to long time ago. At that time people believed that good and bad spirits appeared when a child was born and influenced that child through his / her life. The belief brought about the custom of having birthday parties. They believed that surrounding the birthday person with friends, family and good wishes would frighten the bad spirits away.
Question: According to the passage, when did people begin to celebrate birthdays?
Options: (A) When they learned that no one could stop time. (B) Before they invented a calendar. (C) Before they learned how time went by. (D) After they had a right way of marking time.
Output: D