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: Language is always changing. In a society where life continues year after year with few changes, the language does not change either. The earliest known languages had difficult grammar but a small, limited vocabulary. Over the century, the grammar changed, and the vocabulary grew. For example, the English and Spanish people who came to America during the sixteenth century gave names to all the new plants and animals they found. In this way, hundreds of new words were introduced into English and Spanish vocabularies. Today life is changing very fast, and language is changing fast too. There are several major language families in the world. Some scientists say there are nine main families, but other scientists divide them differently. The languages in each family are connected, and scientists think that they came from the same parent language. About 3 percent of the people in the world speak languages that are not in these major families.
Question: The early language had _ .
Options: (A) a lot of problems (B) words and easy grammar (C) words but no grammar (D) grammar but not many words
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: The rain had continued for a week and the flood had created a big river which were running by Nancy Brown's farm. As she tried to gather her cows to a higher ground, she slipped and hit her head on a fallen tree trunk. The fall made her unconscious for a moment or two. When she came to, Lizzie, one of her oldest and favorite cows, was licking her face. At that time, the water level on the farm was still rising. Nancy gathered all her strength to get up and began walking slowly with Lizzie. The rain had become much heavier, and the water in the field was now waist high. Nancy's pace got slower and slower because she felt a great pain in her head. Finally, all she could do was to throw her arm around Lizzie's neck and try to hang on. About 20 minutes later, Lizzie managed to pull herself and Nancy out of the rising water and onto a bit of high land, which seemed like a small island in the middle of a lake of white water. Even though it was about noon, the sky was so dark and the rain and lightning was so bad that it took rescuers more than two hours to discover Nancy. A man from a helicopter lowered a rope, but Nancy couldn't catch it. A moment later, two men landed on the small island from a ladder in the helicopter. They raised her into the helicopter and took her to the school gym, where the Red Cross had set up an emergency shelter. When the flood disappeared two days later, Nancy immediately went back to the "island." Lizzie was gone. She was one of 19 cows that Nancy had lost in the flood. "I owe my life to her," said Nancy with tears.
Question: What did Nancy try to do before she fell over?
Options: (A) Measure the depth of the river (B) Look for a fallen tree trunk (C) Protect her cows from being drowned (D) Run away from the flooded farm
Example Output:
C