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: Ed Viesturs grew up in Rockford, Illinois, where the tallest thing on the horizon was the water tower. But on Thursday, Viesturs became the only American to climb to the top of the world's 14 highest mountains. His last hike was up Mount Annapurna, in Asia's snowcapped Himalayas. At 26,545 feet, its peak is the 10th highest in the world. It is the mountain that inspired him to start climbing. "It tends to be the trickiest, the most dangerous," said Viesturs. "There's no simple way to climb it. There are threatening avalanches and ice falls that protect the mountain." In high school, Viesturs read French climber Maurice Herzog's tale of climbing the icy Annapurna. Herzog's story was of frostbite and difficulty and near-death experiences. Viesturs was right away. Viesturs got his start on Washington's Mount Rainier in 1977, guiding hikes in the summer. Fifteen years ago, he set out to walk up to the world's highest peaks. Finally, he's done. The pioneering climber talks about mountains as if they were living creatures that should be treated with respect. "You have to use all of your senses, all of your abilities to see if the mountain will let you climb it," said Viesturs. "If we have the patience and the respect, and if we're here at the right time, under the right circumstances, they allow us to go up, and allow us to come down." What's next for a man who can't stop climbing? "I'm going to hug my wife and kids and kind of kick back and enjoy the summer," says Viesturs. But for a man who's climbed the world's 14 tallest mountains, he will probably soon set off on yet another adventure.
Question: What record has Ed Viesturs set?
Options: (A) He has succeeded in climbing to the world's 14th highest mountain. (B) He has been to the top of the world's 14 highest mountains. (C) He has become the first to climb to the height of 26,545feet. (D) He has become the first man to climb to the top of 14 highest mountains in the world.

Output: B

Input: Consider Input: Article: Americans are buying more products and services than ever before through the Internet, and the popularity of online sales is likely to spread to other countries. Online sales now represent as much as one-tenth of all retail sales in the United States,which has led traditional stores to seek new ways to keep their customers loyal. Lynne Shaner used the Internet to buy everything she needed for her wedding and holiday gifts for her husband. Other than food, 90 percent of her purchases were made on her home computer. "I find that, by being able to go online and _ the things that I need to select and have them delivered to me right at my doorstep, I'm free from all the driving, all the crowds, all the noise, and I usually get a better selection." There are a lot of people like her. Experts say American online shopping hit records in both November and December. Fifty-seven percent of Americans have bought something electronically. Store owners worry that this growing amount of online sales will hurt their business. Cornell University marketing professor Ed McLaughlin says, "They should be worried. Anything that can move online will be sold online. And it's just a matter of time. However, traditional stores can keep their customers by selling goods like clothing, which buyers may want to see and try on before purchasing. The stores could also offer things that are difficult to ship. " Bill Martin, whose business helps stores learn about their customers, says, "Traditional stores offer a social experience that some people enjoy. There is still a lot of emotion in the buying decision that takes place, and you can't always get that on-line. It's a rather cold process. Traditional stores can provide goods for buyers more quickly than online stores. And some retailers are using websites to persuade people to visit their stores. " While online shopping worries some business owners, the only worry for delivery services like FedEx and UPS is keeping up with the number of packages. UPS Manager Dana Kline says her company is very busy at this time of year. UPS is so busy that it has filled 55,000 temporary worker positions during the holiday season.
Question: According to Lynne Shaner, shopping online _ .
Options: (A) helps choose things she needs most (B) will replace traditional shopping soon (C) offer many benefits to customers (D) seldom provides a better selection

Output: C

Input: Consider Input: Article: Siri is an artificial intelligence (AI) that you can carry around in the pocket, where it waits patiently to be told what to do. In the week we spent together, my AI assistant has performed admirably in finding me restaurants, or the location of the nearest coffee shop. A typical command might be: "Reserve a table for two at a good French restaurant in San Francisco." Siri responds by presenting a list of top-rated restaurants that can be booked on OpenTable.com. If you say which time you want, it can book you a table without your lifting a finger. In some ways Siri is just a fancy front-end to the 35 sites it can connect to, from taxi booking sites to movie review databases. But what's new is the way it can analyze the intentions of its master or mistress and use those sites to put them into action. Siri attaches probabilities to the explanation of each word and cross-references with your location and other data, some of which you must provide yourself. To send email reminders, Siri obviously needs to know your email address. To "find me the flower shop closest to work", it needs to know where you work. To pay bills or buy airline tickets, it would need access to your credit card. That raises the question of how far we are willing to trust a piece of software that can go and do things for us based on what it "thinks" we mean, a topic that occupies some engineers working on artificial intelligence. The more data, and power, you give your virtual assistant, the more damage it could do. Siri may be simple, and always shows its explanation of a command before carrying it out. But it gives users a preview of a new balance between privacy, trust and convenience that the expansion of AI into everyday life is likely to develop.
Question: What is Siri?
Options: (A) A digital e-book reader. (B) A music-sharing software. (C) A voice-controlled website. (D) An artificial intelligence software.
Output: D