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.

[EX Q]: Article: Experts believe that storms and severe weather in North America and Asia have disrupted bird flight paths across the world and swept huge numbers of bird species towards the British Isles. Birds flying to the other side of the Atlantic or to the Pacific to lay their eggs have been trapped in Britain and Ireland, adding their numbers to native species, and causing great excitement in the bird-watching community. Local birdwatchers have already observed a total of 442 species in the British Isles this year. The highest number ever seen in one year is 445, in 2008. "We only need four more to break our record," said Lee Evans, who runs the British Birding Association. "With three months to go I'm sure we'll do it." Last month an extremely rare Siberian Rubythroat bird was seen in Scotland, sending hundreds of birdwatchers north in the hope of catching a glimpse of this colourful Asian beauty. Another very uncommon bird, the bufflehead duck was cited in Cornwell and caused similar excitement. "I couldn't believe it," said Evans. "The poor thing was completely _ . It must have been blown to England by the storms while trying to fly from Canada to the southern United States for the winter. That's 3000 miles!" Evans said that global warming over the past decade was playing a key role in transforming bird movements across the world. In addition, melting Arctic sea ice may also be opening up bird flight paths over the North Pole, making it easier for birds from the Pacific -- such as the slaty-backed gull and tufted puffin, both of which appeared in London earlier this year -- to reach Britain. Bird-watching is becoming an increasingly popular hobby among all age groups, added Evans. "A fifth of our members are under 18. This is a round-the-year hobby that you can enjoy from the kitchen window or from a car. More and more people are bird-watching, and as a result more and more unexpected species are being spotted in the British Isles."
Question: What is the passage mainly about?
Options: (A) The results of global warming. (B) Changes in the British bird population. (C) Increasing environmental pollution. (D) Worsening British weather.
[EX A]: B

[EX Q]: Article: With America's national debt continuing to climb, Congress is constantly debating ways to save money. The Dollar Coin Alliance, a lobbying group, says billions could be saved if dollar coins were used instead of paper bills. But many people won't use them. The U.S. government tried to push dollar coins again in recent years, but then suspended almost all production in 2011. American likes paper dollars, but Jim Kolbe, co-chairman of the Dollar Coin Alliance, thinks switching to the coin is worth it. "The coin does cost more to produce, roughly on the neighborhood of 17 cents versus the 5 or 6 cents that a paper dollar costs to produce," he said. "However, the coin lasts 35 years, and it's made of mostly recycled metals, and the paper has to be produced from new materials, and we shred 3 billion of those every year because they wear out." For years, the former Arizona congressman has been pushing legislation that would prop up the dollar coin by phasing out the greenback -- a move that has met resistance from both politicians and the public. But today, he said, _ and a recent poll indicates 61 percent of Americans like the idea. "When they learn of the savings that can be involved with this, they will support the idea of substituting the coin for the paper dollar," he said. Major savings Kolbe points to a study by the Government Accountability Office, which investigates how the government spends taxpayer dollars. The GAO estimates taxpayers would save more than $4 billion over 30 years, and that figure could be much higher. That appeals to taxpayer Christy Thompson, who said, "I'd probably say, yes, we need to do it." But plenty of people aren't convinced, including Kim Doering of Alexandria, Virginia. "It's easier to carry the paper bill than a bunch of coins. They're louder; they're heavier in your pocket," she said. Washington, D.C. restaurant owner Sue Fouladi doesn't like the idea of having more dollar coins in her cash register. "It's very inconvenient," she said. "If I don't have a choice, then I'll do it, but I'll be a very unhappy person." Adding to the problem is that the gold- and silver-colored metal coins are about the same size as the 25-cent quarter. Robert Blecker, an economics professor at American University in Washington, says the dollar coins should be a different size and thickness. "And if we can design a dollar coin that's not so big and bulky, probably Americans would like it better," he added. But that doesn't bother college student Emily Sturgill. "Sometimes they fit into your pocket easily and you don't have to worry about them slipping out, like a dollar bill would if you brought your keys or your phone out," she said.
Question: Which of the following is the advantage of dollar coins according to the passage?
Options: (A) They cost less than paper bills . (B) They are convenient to carry. (C) They are not easy to wear out. (D) They are produced from new materials.
[EX A]: C

[EX Q]: Article: You are invited to join PTPI (People to People International)'s President and CEO, Mary Jean Eisenhower, inprefix = st1 /America's Capitol for the2009 Global Youth Conference! In D.C., you will spend four exciting days exploring into this year's theme, "Global Sustainability: It's All Connected!" Come to the GYC to learn how you can work together with friends from around the world to create a better, brighter and greener future! 250 students will stay in the Hyatt Crystal City Hotel in Arlington,Virginiafrom November 11-15, 2009 for this eye-opening conference. We hope that you will join us in exploring PTPI's mission through international understanding, education, leadership and humanitarianism! Highlights of this event will include: * A key-note address presented by PTPI's President and CEO, Mary Jean Eisenhower! * An interactive student group, featuring your peers from across the globe! * Take an active part in sustainingWashington,D.C.through a service project benefiting the Anacostia Watershed! * A unique tour of Washington,D.C.-- we promise that you have never seen D.C. this way before! * An opportunity to reunite with old friends and make new ones from around the World! Application Successful applicants aged 13-18 who will be enrolled in a middle school, high school or home school during the time of the conference will be accepted _ . We urge students to APPLY ON-LINE TODAY, as applications will likely exceed available space. Upon acceptance into the Global Youth Conference, you will receive a confirmation notice and other important information via e-mail. If you have any questions regarding the application process, please contact People to People International: youthconference@ptpi.org
Question: Which of the following students is most likely to be able to attend the GYC?
Options: (A) A third grader in a primary school. (B) A 19-year-old student at college. (C) A student who receives a confirmation notice. (D) A student who sends the application on Nov. 17.
[EX A]:
C