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: In the near future,we may be using our eyes to operate our smart-phones and tablets,even when it comes to playing popular games like Fruit Ninja. The Gaze Group has been developing eye-controlled computer technology for nearly 20 years.But those devices have been firstly designed to help those with disabilities,and are very expensive. "After a while,we figured out that probably the best way is to go for a mass-market way," says Gaze's Sune Alstrup Johansen."where everybody would have this available." Johansen and some of his colleagues have formed a new company,the Eye Tribe,which is hoping to develop the technology on a mass commercial level. The technology works with the help of the computing device toward the user's face. After making sure of the user's eye movements,the technology is then able to easily find where a person's eyes are moving,and then allow the eyes to control a cursor . "Our software can then determine the location of the eyes and know where you're looking on the screen to make sure what you're looking at,"reads an explanation on the Eye Tribe site. There has been a gradual change toward hands-free technology in recent years, particularly in the gaming world.Recently Xbox released the Kinect device,which lets users control their Xbox and play certain games using only their hands,legs and voices. But still,most of these devices have been more of a _ than a practical way to use one's hands to control a mobile device.Johansen said a replaceable filter would be a cheap,convenient way for most consumers. And even as companies like The Eye Tribe work to create such a product for the average user, making the eye-controlled technology more accessible and less expensive will have similar benefits for physically disabled users. For more articles on modern science,please CLICK here.
Question: Which of the following is the main idea of the passage?
Options: (A) An introduction of a new device. (B) An introduction of smart-phones. (C) An introduction of eye-controlling technology. (D) An introduction of a new technology for the disabled.
Example Output: C

Example Input: Article: Jenny went to visit her friends in New York last weekend.Her friends met her at the airport on Friday afternoon and drove her to the hotel.They had dinner at a Chinese restaurant and went to see a film after that. Jenny and her friends set out early on Saturday morning for a farm and stayed there until Sunday morning.During their stay, they went fishing and swimming in the small river on the farm.They played football in the field and enjoyed a big meal around a camp fire , singing and dancing till late into the night. Nobody could get up early on Sunday morning.So when they got back to New York City, it was about three o'clock in the afternoon.They drove right to the airport because Jenny didn't want to miss her plane back home.Jenny only stayed in New York for two nights but she had a great time with her friends.
Question: Jenny went to New York _ .
Options: (A) to do some shopping (B) to see her friends (C) to spend her summer holiday (D) to find a job
Example Output: B

Example Input: Article: Steve Jobs made technology fun.The co-founder of Apple died last Wednesday at the age of fifty-six He had fought for years against cancer.Mourners gathered outside his house in Palo Alto, California, and Apple stores around the world. Tim Bajarin, president of a high-tech research and consulting company, said "If you actually look at a tech leader, they're really happy if they have one hit in their life.Steve Jobs has the Apple II, the Mac, the iPod, the iPhone, the iPad and Pixar." Steve Jobs was a college dropout.He was adopted by a machinist and his wife, an accountant.They supported his early interest in electronics. He and his friend Steve Wozniak started Apple Computer--now just called Apple--in nineteen seventy-six.They stayed at the company until nineteen eighty-five.That year, Steve Wozniak returned to college and Steve Jobs left in a dispute with the chief executive. Mr.Jobs then formed his own company, called NeXT Computer.He rejoined Apple in nineteen ninety-seven after it bought NeXT.He helped remake Apple from a business that was in bad shape then to one of the most valuable companies in the world today. Steve Wozniak, speaking on CNN, remembered his longtime friend as a "great visionary and leader'' and a "marketing genius ". President Obama said in a statement: "By building one of the planet's most successful companies from his garage, _ .By making computers personal and putting the Internet in our pockets, he made the information revolution not only accessible, but intuitive and fun." David Carroll is a professor at Parsons School of Design in New York City.He says Steve Jobs not only revolutionized technology, he also revolutionized American business. "The fact that he was able to redesign American commerce top to bottom and across is really stunning .He probably will be considered an industrial giant on the scale of Thomas Edison and Henry Ford, so one of the great[s] of all time." David Carroll said. Steve Jobs stepped down as Apple's chief executive in August because of his health.He died a day after the company released a new iPhone version that met with limited excitement.Apple's new chief, Tim Cook, will also have to deal with the new Kindle Fire tablet computer from Amazon.com.It costs less than half as much as an iPad but also does less.
Question: Why did people all over the world mourn Steve Jobs?
Options: (A) He was very courageous in the face of cancer. (B) He became very rich though dropping out college. (C) He released a new iPhone version before death. (D) He revolutionized technology and made it enjoyable.
Example Output:
D