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: Different kinds of soil conservation methods are used by farmers to protect their land from damage by farming and the forces of nature. One important form of soil conservation is the use of windbreaks. Windbreaks are barriers formed by trees and other plants with many leaves. Farmers plant them in lines around their fields. Windbreaks stop the wind from blowing soil away. They also keep the wind from destroying or damaging crops. They are very important for growing grains, such as wheat. There have been studies done on windbreaks in parts of West Africa, for example. They found that grain harvests can be twenty percent higher in fields protected by windbreaks compared to fields without such protection. However, windbreaks seem to work best when they allow a little wind to pass through. If the wall of trees and plants stops wind completely, then violent air motions will take place close to the ground. These motions will lift soil into the air where it will be blown away. For this reason, a windbreak is best if it has only sixty to eighty percent of the trees and plants needed to make a solid line. There should be at least two lines in each windbreak. One line should be large trees. The second line, right next to it, can be shorter trees and other plants with leaves. Locally grown trees and plants are best for windbreaks.
Question: What is a windbreak according to the passage?
Options: (A) A windbreak is a concrete wall to prevent the strong winds. (B) A windbreak is a wood with different kinds of trees. (C) A windbreak is a wall of trees to hold soil in place. (D) A windbreak is a wall of wind to fight wind from the opposite way.

Output: C

Input: Consider Input: Article: Do you want to visit Warwick Castle in Britain? Warwick is a friendly and a memorable experience with something for all ages.Easily accessible by car, bus, train, cycling or on foot it is surrounded by historic buildings and numerous attractions. Ticket Prices &Offers Look at our online offers, Warwick-Castle, com is the only place to purchase the Ultimate Castle and The Castle Dungeon ticket at the best price. Online bookings must be made 24 hours before you visit.Please note that admission to The Castle Dungeon is NOT included with standard online or on the day tickets.There are limited Dungeons tickets available, and only from Warwick-Castle, corn.Please book in advance to guarantee your Castle Dungeon experience. One Day Tickets Booking online is the best way to get your tickets for Britain's Ultimate Castle.Save 20% and skip the ticket queue when you arrive - it couldn't be easier! If you're not sure when you want to visit then don't worry, you can still book a Flexible Ticket-valid for any day that the castle is open during 2010. Buy tickets online now! Important notes on ticketing Please note that if you wish to visit the Castle using an on-the-day promotional voucher ,your Dungeon experience can be prebooked by calling 0870 442 2375. A PS1.50 fee applies to all bookings made online and via telephone - one fee per booking.Children must be accompanied by an adult.Group rates are available for groups of more than 10 people.Groups can book by calling 0870 442 2371 or online.
Question: .If you hope to visit Castle Dungeon, you should _ .
Options: (A) buy the ticket in person (B) dial 0870 442 2371 (C) book the ticket from Warwick-Castle, corn (D) book the ticket two days in advance

Output: C

Input: Consider Input: Article: The day after news broke of a possible revolution in physics ----particles moving faster than light ?a scientist leading the European experiment that made the discovery calmly explained it to a standing-room- only crowd at CERN. The physicist, Dario Auterio, did not try to explain what the results might mean for the laws of physics, let alone the broader world.After an hour of technical talk, he simply said, "Therefore, we present to you today this difference, this unusualness." But what unusualness it may be.From 2009 through 2011, the massive OPERA detector buried in a mountain in Gran Sasso, Italy, recorded subatomic particles called neutrinos ( ) arriving faster than light can move in an empty space.The neutrinos generated at CERN are hardly detectably early.If confirmed, the finding would throw more than a century of physics into disorder. "If it's correct, it's _ ." said Rob Plunkett, a scientist at Fermilab, the Department of Energy physics laboratory in Illinois."We'd be looking at a whole new set of rules" for how the universe works.Those rules would bend, or possibly break, Albert Einstein's special theory of relativity, published in 1905.Basical at the time, the theory tied together space and time, matter and energy, and set a hard limit for the speed of light, later measured to be about 186, 000 miles per second. No experiment in 106 years had broken that speed limit.Physicists expect strict study to follow, which OPERA and CERN scientists welcomed. Fermilab operates a similar experiment, called MINOS, that shoots neutrinos from Illinois to an underground detector in Minnesota.In 2007, MINOS discovered a just detectable amount of faster than-light neutrinos, but the permissible difference of error was too big to "mention" , Plunkett said. Fermilab scientists will reanalyze their data, which will take six to eight months.In 2013, the MINOS detector, now offline, will restart after an upgrade.It could then offer confirmation of the results.
Question: Why are the European scientists not sure about the results of the experiment?
Options: (A) Because they are so unexpected. (B) Because the scientists do not believe them. (C) Because the scientists are careful and calm. (D) Because they are against the present law of physics.
Output: D