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: Nathan's second-hand bike was good enough to get him anywhere he wanted to go. Of course, it couldn't match Tim's in a normal speed race, but all the fancy gears in the world wouldn't get you up Black Mountain. It was so steep in places that you had to get off your bike and push. On this particular afternoon, the odds were all on Nathan's side. First, he was stronger. Tim had always been thin, but recently he'd started to grow so fast that his arms and legs were like pieces of spaghetti. As well as being considerably fitter than his friend, Nathan knew the shortcuts up prefix = st1 /BlackMountain. So when Nathan accepted the challenge, he was sure he'd win. He nearly always did, in competitions with Tim. That was what was strange. Tim was so competitive, and yet he wasn't any good at physical things. By the time the two boys were three quarters of the way to the top, Nathan was clearly ahead. While the road zigzagged back and forth up the mountainside, in certain places, there were also vertical tracks, where water rushing down the slope in winter had bitten erosion courses into the soil. These had in turn been so overgrown by bushes and long grass in the spring that they looked like tunnels through the bush. The trick was to know where you could cut off a whole bend in the road by leaving the road and pushing your bike up one of these half-hidden pathways. If you chose the wrong one you'd struggle up for ten minutes and then suddenly reach a dead end. Then there was no choice but to go back.
Question: What did Tim challenge Nathan to do?
Options: (A) test who had the fastest bike (B) decide who was the most competitive (C) find the secret tracks on the mountain (D) race to the top of BlackMountain
Example Output: D

Example Input: Article: A scientist working at her lab bench and a six-old baby playing with his food might seem to have little in common.After all,the scientist is engaged in serious research to uncover the very nature of the physical world,and the baby is,well, just playing...right?Perhaps,but some developmental psychologists have argued that this"play"is more like a scientific investigation than one might think. Take a closer look at the baby playing at the table.Each time the bowl of rice is pushed over the table edge,it falls in the ground---and, in the process, it belongs out important evidence about how physical objects interact ; bowls of rice do not flood in mid-sit, but require support to remain stable. It is likely that babies are not born knowing the basic fact of the universe; nor are they ever clearly taught it. Instead, babies may form an understanding of object support through repeated experiments and then build on this knowledge to learn even more about how objects interact. Though their ranges and tools differ, the baby's investigation and the scientist's experiment appear to share the same aim(to learn about the natural world ), overall approach (gathering direct evidence from the world), and logic (are my observations what I expected?). Some psychologists suggest that young children learn about more than just the physical world in this way---that they investigate human psychology and the rules of language using similar means. For example, it may only be through repeated experiments, evidence gathering, and finally overturning a theory, that a baby will come to accept the idea that other people can have different views and desires from what he or she has, for example, unlike the child , Mommy actually doesn't like Dove chocolate. Viewing childhood development as a scientific investigation throws on how children learn ,but it also offers an inspiring look at science and scientists. Why do young children and scientists seem to be so much alike? Psychologists have suggested that science as an effort ---the desire to explore, explain, and understand our world---is simply something that comes from our babyhood. Perhaps evolution provided human babies with curiosity and a natural drive to explain their worlds, and adult scientists simply make use of the same drive that served them as children. The same cognitive systems that make young children feel good about feel good about figuring something out may have been adopted by adult scientists. As some psychologists put it, "It is not that children are little scientists but that scientists are big children."
Question: According to some developmental psychologists,
Options: (A) a baby's play is nothing more than a game. (B) scientific research into babies; games is possible (C) the nature of babies' play has been thoroughly investigated (D) a baby's play is somehow similar to a scientist's experiment
Example Output: D

Example Input: Article: Working at camp is a great journey that not only creates lifelong memories for yourself ,but the chance to make an influence on the loves of children who attend Kids Camp. As a summer camp professional, you are a teacher , a friend and most importantly a role model. Staff-members ensure the Our youngest staff is 18, but most are over 20 years old we desire a staff with a strong interest in children and job-related experience,Each tent has six campers and two staff members ,We run an exciting range of activities and programs such as Athletics, Arts, Basketball ,Computers , Field Games, Fun & Games, Gardening, Hiking, High\Low Ropes Course, Nature Education. Great Reasons to Become a Camp Professional Meet energetic, warm-hearted staff from around the world Gain meaningful leadership experience Sing crazy songs and wear funny costumes A positive challenge you will remember in the rest of your life Make a difference to the life of a child Staff Needs Lifeguards --Red Cross certified preferably holding a current WSI certification High Ropes Staff--training/certification from a nationally recognized organization Fun & Games - lead non-competitive athletic games Juggler/Clown - teach circus skills Archery - with certification from a nationally recognized course Nature/ Garden - with strong knowledge or interest in natural wildlife and gardening Dave Meizels , Camp Director E-mail: demeizels@channe12kidscamp.org Tel:860-742-2267 Contact Dave if you have any questions about our-application process.
Question: What's the main idea of the text?'
Options: (A) .Various activities of Kids Camp. (B) .Benefits of working at Kids Camp. (C) .How to sign up for Kids Camp. (D) .Employing staff for Kids Camp.
Example Output:
D