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.

Example Input: Article: Heather Jack and her family, including her two children, usually spend the Christmas holidays preparing a feast--for others to eat. Last Christmas Eve, they went to a house in the neighborhood and prepared a dinner for an elderly woman and her son, who has muscular dystrophy . They stayed for an hour and chatted before heading home to prepare for a visit from Santa . "I think it is that kind of direct experience that many find so meaningful," says Heather, president and founder of The Volunteer Family, a Boston-based organization dedicated to matching families with volunteer opportunities, both during the holidays and year-round. "It's a great way for parents to involve the kids." In a holiday season that stretches from before Thanksgiving to just after the New Year, it's nice to hear stories about people with their children giving instead of receiving. Last December Gary and Debra Danoff and their two teenage sons drove to the Washington, D. C. Jewish Community Center(JCC) and spent Christmas morning in the Center's kitchen preparing a feast for homeless shelters. By choosing to prepare meals for the homeless, the Danoffs bring together a belief in community service with their love of cooking, "It feels good to prepare food with our kids for other people at Christmas," says Gary. "We want them to know that many people don't have the ability to go to the supermarket and pick the foods they want to eat and pay for them." The Danoffs were in good company. Across the city, at least 1000 volunteers with their children went across the region to provide food to the poor people as part of the D. C. JCC's annual "December 25th Day of Service", now in its 22nd year.
Question: The Heathers did all the following things except_last Christmas Eve.
Options: (A) preparing a dinner for a poor family (B) chatting with the elderly mother and her disabled son (C) making preparations for their own Christmas festival (D) visiting one of their good friends in other district
Example Output: D

Example Input: Article: Computer power is moving into the "cloud"--networks of data centres that use the Internet to supply all kinds of services, from e-mail and social networks to data storage and analysis. The rise of cloud computing is rapid and causing huge changes in the tech industry. The old guard is suffering: this week's $67 billion merger between Dell and EMC, makers of computers and storage devices respectively , was a marriage forced by the rise of the cloud. Disruptive newcomers are blooming: if Amazon's cloud-computing unit were a stand-alone public company, it would probably be worth almost as much as Dell and EMC combined. The gains for customers have been equally dramatic. Compared with older IT systems, cloud computing is often much cheaper. It adds tremendous flexibility: firms that need more computing capacity no longer have to spend weeks adding new servers and installing software. In the cloud they can get hold of it in minutes. Their applications can be updated continually, rather than just every few months. Individual users can reach their e-mails, files and photos from any device. And cloud services also tend to be more secure, since providers know better than their customers how to protect their computing systems against hackers. But cloud computing makes one problem worse. In the old IT world, once a firm or a consumer had decided on an operating system or database, it was difficult and costly to switch to another. In the cloud this "lock-in" is even worse. Cloud providers go to great lengths to make it easy to upload data. They accumulate huge amounts of complex information, which cannot easily be moved to an alternative provider. Cloud firms also create a world of interconnected services, software and devices, which is convenient but only for as long as you don't venture outside their universe. Being locked in to a provider is risky. Firms can start to tighten the screws by increasing prices. If a cloud provider goes bust , its customers may have trouble getting back their data. These risks have already caused a debate about whether the cloud needs stricter regulation. Some European politicians want to force cloud providers to ensure that data can be moved between them. That is too heavy-handed, because strict rules will inhibit innovation in what is still a young industry. The history of computing suggests that common standards may well appear naturally in response to customers' demands--just as in personal computers, where it is now much easier to use the same files on different systems. In the meantime, a few commonsense measures can reduce the risk of lock-in. Firms that use more than one cloud provider to host their data are less affected. So are those that keep their most important information in their own data centres. Consumers can take precautions, too. Some services are better than others at enabling users to move data between providers (Google does well on this score). Cloud computing promises its users many benefits, but don't mistake it for some sort of digital heaven.
Question: The author takes "the merger between Dell and EMC" for example to show _ .
Options: (A) the influence of cloud computing on computer and storage device makers (B) the miserable sufferings of old computer companies (C) the rapid development of new computer companies (D) the interaction between old companies and newcomers
Example Output: A

Example Input: Article: Older people with hearing loss may suffer faster rates of mental decline. People who have hearing trouble suffered meaningful impairments in memory, attention and learning about three years earlier than people with normal hearing, a study published online January 21 in JAMA Internal Medicine reveals. The finding supports the idea that hearing loss can have serious consequences for the brain,says Patricia Tun of Brandeis University in Waltham,Mass., who studies aging. "I'm hoping it will be a real wake-up call in terms of realizing the importance of hearing. " Compared with other senses, hearing is often overlooked, Tun says. "We are made to interact with language and to listen to each other, and it can have damaging effects if we don't." Frank Lin of Johns Hopkins School of Medicine and colleagues tested the hearing of 1,984 older adults. Most of the participants, who averaged 77 years old, showed some hearing loss -- 1,162 volunteers had trouble hearing noises of less than 25 decibels, comparable to a whisper or rustling leaves. The volunteers; deficits reflect the hearing loss in the general population: Over half of people older than 70 have trouble hearing. Over the next six years, these participants underwent mental evaluations that measured factors such as short-term memory, attention and the ability to quickly match numbers to symbols. Everybody got worse at the tasks as time wore on, but people with hearing loss had an especially sharp decline, the team found. On average, a substantial drop in performance would come about three years earlier to people with hearing loss. Lin cautions that the study has found an association between hearing loss and mental abilities; the researchers can't conclude that hearing loss directly causes the decline. Yet more and more studies are turning up ways that diminished hearing could damage the brain. A person who can't hear well might avoid social situations, and isolation is known to be bad for the brain. "You gradually become more socially withdrawn, " Lin says. "Social isolation is a major, major factor for dementia and cognitive decline. " Other studies suggest that when people struggle to interpret and decode words, their brains _ energy away from other tasks, such as memory. Audiologist and psychologist Kathy Pichora -- Fuller says that this brain drain happens to everyone, even people without hearing loss. Studies have shown that people are worse at remembering things when they're in a noisy room, for instance. People with hearing loss may be constantly diverting a large swath(--)of their brainpower,leaving less for other mental tasks, says Pichora-- Fuller, of the University of Toronto Mississauga.
Question: Mass does the research to _ .
Options: (A) present the mental decline (B) attach importance to hearing (C) compare hearing with other senses (D) exaggerate the damaging effects
Example Output:
B