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.
--------
Question: Article: Winter begins in the north on December 22nd. People and animals have been doing what they always do to prepare for the colder months. Squirrels , for example, have been busy gathering nuts from trees. Well, scientists have been busy gathering information about what the squirrels do with the food they collect. They examined differences between red squirrels and gray squirrels in the American state of Indiana. The scientists wanted to know how these differences could affect the growth of black walnut trees. The black walnut is the nut of choice for both kinds of squirrels. The black walnut tree is also a central part of some hardwood forests. Rob Swihart of Purdue University did the study with Jake Goheen, a former Purdue student now at the University of New Mexico. The two researchers estimate that several times as many walnuts grow when gathered by gray squirrels as compared to red squirrels. Gray squirrels and red squirrels do not store nuts and seeds in the same way. Gray squirrels bury nuts one at a time in a number of places. But they seldom remember where they buried every nut. So some nuts remain in the ground. Conditions are right for them to develop and grow the following spring. Red squirrels, however, store large groups of nuts above ground. Professor Swihart calls " _ ". Gray squirrels are native to Indiana. But Professor Swihart says their numbers began to decrease as more forests were cut for agriculture. Red squirrels began to spread through the state during the past century. The researchers say red squirrels are native to forests that stay green all year, unlike walnut trees. They say the cleaning of forest land for agriculture has helped red squirrels invade Indiana. Jake Goheen calls them a sign of an environmental problem more than a cause.
Question: The study done by Rob Swihart and Jake Goheen is to _ .
Options: (A) find out the living conditions for squirrels (B) learn squirrels' influence on black walnut trees (C) do something to get rid of squirrels (D) save the forests in the American state of Indiana

Answer: B

Question: Article: Tips for avoiding traffic jams The radio has more than just music. Check the local news station for the latest traffic report. Or go online and check traffic cameras before you set out. If there is a jam, you'll be prepared and can try another route. Take the road less traveled. Although highways may be the most direct route, back roads can be much less crowded, which can save you from the frustration of the stop-and-go traffic. Rush hour isn't just a lovely nickname. It means the morning and afternoon traffic lasts for several hours, but they are still called "rush hour" for a reason--everyone's on the road and in a hurry to get somewhere. Treat rush hour like bad weather--if you don't have to go anywhere, stay off the roads. Tips for those unavoidable traffic jams Don't break the law. You've gone 30 feet in 30 minutes and all of a sudden you see people using the shoulders . Don't behave like them. Not only is this illegal, but also there's a good chance they'll get caught or cause even more problems. Pay extra attention to zig-zaggers when some people are anxious, they may start changing lanes every 5 seconds or cut you off. Keep checking your windows and mirrors for these lane changers. Look for an escape. If it is possible to exit the road safely, do it. Use a GPS unit, and you can change your route mid-trip if needed. Be courteous. Good manners could help you avoid a possible accident. Allow people in from a lane that is ending. Speeding up to keep them out increases your chances of an accident.
Question: To avoid traffic jams, we are advised to do the following EXCEPT_.
Options: (A) get traffic news before leaving (B) choose back roads (C) avoid rush hours (D) change lanes frequently

Answer: D

Question: Article: Luggage We ask you to keep a medium - sized suitcase per person, but a small holdall can also be taken onto the coach. Seats Requests for particular seats can be made on most coach breaks when booking, but since seats are booked on a first come, first serve basic, early booking is advisable. When bookings are made with us, you will be offered the best seats that are available on the coach at that time. Travel Documents When you have paid your deposit we will send you all the necessary documents, so that you receive them in good time before the coach break leaving date. Certain documents, for example, air or boat tickets, may have to be reserved and your guide will then give them to you during the break. Special Diets If you require a special diet, you must inform us at the time of booking with a copy of the diet. This will be told to the hotels on your coach break. The hotels for certain coach breaks are tourist class and they may not have the equipment to deal with special diets. Any extra costs must be paid by yourself before leaving the hotel. Accommodation On any coach break there are only a limited number of single rooms. When a single room is available, it may be subject to an extra charge and this will be shown on the brochure page. Entertainment Some of our hotels arrange extra entertainment which could include music, dancing, films, etc. The nature and frequency of the entertainment presented is decided by the hotel and therefore not guaranteed and could be withdrawn if there is a lack of demand or insufficient numbers in the hotel.
Question: If you want to choose certain seats of the coach, you should _ .
Options: (A) take little luggage (B) avoid traveling in holidays (C) book your seats well in advance (D) arrive early on the leaving date

Answer:
C