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.

Q: 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

A: B
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Q: Article: It seems like every day there's some new research about whether our favorite drinks are good for us. One day, science says a glass of red wine a day will help us live longer. The next day, maybe not. It seems journalists are pretty interested in wine research and the same might be said for coffee. Now there's been a lot of research into whether coffee's good for our health "the results have really been mixed",admits Neal Freedman who led the coffee study and published his findings in a medical journal recently. "There's been some evidence that coffee might increase the risk of certain diseases and there's also been maybe more recent evidence that coffee may protect against other diseases as well". Freedman and his colleagues undertook the biggest study yet to look at the relationship between coffee and health. They analyzed data collected from more than 400,000 Americans ages 50 to 70 participating in the study. "We found that the coffee drinkers had a modestly lower risk of death than the non-drinkers, he said. Here's what he means by "modestly": those who drank at least two or three cups a day were about 10 percent or 15 percent less likely to die for any reason during the 13 years of the study when the researchers looked at specific causes of death, coffee drinking appeared to cut the risk of dying from heart disease, lung disease injuries, accidents and infections. Now, Freedman stressed that the study doesn't prove coffee can make people live longer .A study like this can never prove a cause-and-effect relationship. All it can really do is to point researchers in the right direction for further investigation. And even if it turns out that coffee is really good for you, scientists have no idea why.
Question: According to the passage, which of the following is TRUE?
Options: (A) Freedman and his colleagues hired 400,000 Americans to collect date. (B) People who took part in Freedman's research are about 50 to 70 years old. (C) About 400, 000 Americans worked for Freedman's team for 13 years. (D) People who are 50 to 70 years old seldom drink wffee.

A: B
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Q: Article: When we are unfamiliar with something, we may feel nervous and fearful. The help of others is a good way to make us pull through. I write for a big newspaper, and I wanted to write a story about parachute jumping. To make it a realistic as well as exciting story, I decided that I first had to make a jump myself. Unfortunately, I am not good at any sport of any kind, let alone parachute jumping. My friend Mr. Smith was willing to give me a hand. He took me to a ground school. The first day's training included several hours of instruction but not my first drop from an airplane. For this, I had to wait until the following morning. The next morning, after a hurried, anxious breakfast, I was taken to the airfield. There, two heavy parachutes were put on my back. Then I was asked to make my way to a small plane which had just stopped slowly on the runway. Once on the plane, it was soon climbing. I began to feel nervous. As we reached one thousand meters, Harry, my teacher, hooked a line from my parachute to a steel ring inside the plane. The line was to pull my parachute open after I jumped. "Get ready, Henry," Harry said. I moved carefully to the door. I wanted to cry, "No, no, no!" but no word came. "Jump!" Harry called out loudly. "Jump!" To my surprise, kicking like a frog, I did jump. Away from the plane, and down, down I fell. It worked! The air seemed to hold me up. I was very happy. Then I felt a quick pull. My big parachute had opened! It was like the best surprise I'd ever had. I looked down. There were rivers, trees, fields and houses. I heard the soft sound of the air. This was fun!
Question: The writer made a parachute jump himself _ .
Options: (A) to learn more about parachute jumping (B) to make his story realistic and exciting (C) to have a rest from his busy work (D) to prove to others his skill and courage

A:
B
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