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.

[EX Q]: Article: Adding math talk to story time at home is a winning factor for children's math achievement, according to a new research from the University of Chicago. The study from psychologists Sian Beilock and Susan Levine shows a marked increase in math achievement among children whose families used Bedtime Math, an iPad app that delivers engaging math story problems for parents and children to solve together. Even children who used the app with their parents as little as once a week saw gains in math achievement by the end of the school year. The app's effect was especially strong for children whose parents tend to be anxious or uncomfortable with math. Previous research from this group has demonstrated the importance of adults' attitudes about math for children's math success. For example, a recent study found that math-anxious parents who help their children with math homework actually weaken their children's math achievement. The new findings demonstrate that structured, positive interactions around math at home can cut the link between parents' uneasiness about math and children's low math achievement. "Many Americans experience high levels of anxiety when they have to solve a math problem, with a majority of adults feeling at least some worries about math," said Beilock, professor in Psychology and author of Choke, a book about stress and performance. "These math-anxious parents are probably less likely to talk about math at home, which affects how competent their children are in math. Bedtime Math encourages a dialogue between parents and kids about math, and offers a way to engage in high-quality math interactions in a low-effort, high-impact way." Study participants included 587 first-grade students and their parents. Families were given an iPad installed with a version of the Bedtime Math app, with which parents and their children read stories and answer questions involving math, including topics like counting, shapes and problem-solving. A control group received a reading app that had similar stories without the math content and questions related to reading comprehension instead. Children's math achievement was assessed at the beginning and end of the school year. Parents completed a questionnaire about their nervousness with math. The more times parents and children in the math group used the app, the higher children's achievement on a math assessment at the end of the school year. Indeed, children who frequently used the math app with their parents outperformed similar students in the reading group by almost three months in math achievement at year's end.
Question: Bedtime Math is an iPad app that _ .
Options: (A) requires parents and children to answer reading comprehension questions (B) assesses children's math achievement and parents' nervousness with math (C) teaches children how to count, recognize shapes and solve practical problems (D) encourages children together with their parents to solve math story problems
[EX A]: D

[EX Q]: Article: A couple who held hands at breakfast every morning even after 70 years of marriage have died 15 hours apart. Helen Felumlee, died at 92 on April 12. Her husband, 91-year-old Kenneth Felumlee, died the next morning. The couple's eight children say the two had been inseparable since meeting as teenagers, once sharing the bottom of a bunk bed on a ferry rather than sleeping on night apart. They remained deeply in love until the very end, even eating breakfast together while holding hands, said their daughter, Linda Cody. "We knew when one went, the other was going to go," she said. According to Cody, about 12 hours after Helen died, Kenneth looked at his children and said, "Mon's dead." He quickly began to fade, surrounded by 24 of his closest family members and friends when he died the next morning. "He was ready," Cody said, "He just didn't want to leave her here by herself." Son Dick said his parents died of old age, surrounded by family. The pair had known each other for several years when they eloped in Newport across the Ohio River from Cincinnati, on Feb. 20, 1994. At two days shy of his 21stbirthday, Kenneth-who went by Kenny-was too young to marry in Ohio. "He couldn't wait.' son Jim said. Kenneth worked as a railroad car inspector and mechanic before becoming a mail carrier for the Post Office. He was active in the church as a Sunday teacher. Helen stayed at home, not only cooking and cleaning for her own family but also for other families in need in the area. She taught Sunday school, too, but was known more for her greeting card ministry, sending cards for birthdays, sympathy and the holidays to everyone in her community, each with a personal note inside. "She kept Hallmark in business," daughter-in-law Debbie joked. When Kenneth retired in 1983 and the children began to leave the house, the Felumlees began to explore their love of travel, visiting almost all 50 states by bus. "He didn't want to fly anywhere because you couldn't see anything as you were going," Jim said. Although both experienced declining health in recent years, Cody said, each tried to stay strong for the other. "That's what kept them going," she said.
Question: From what Cody said, we can learn the children _ .
Options: (A) were not in front of their father (B) don't look after their father (C) foresaw their father would go (D) surrounded their father
[EX A]: C

[EX Q]: Article: In my experience, one of the greatest reasons of unhappiness is the difficulty we have in accepting things as they are.When we see something we don't like, we wish it could be different-we cry out for something better.That may be human nature, or perhaps it's something that has been grown in our culture. The root of the unhappiness isn't that we want things to be different, however, it's that we decided we didn't like it in the first place.We've judged it as bad, rather than saying, "It's not bad or good, but it just is." Here is an example.I have written a paper, A Beautiful Method to Find Peace of Mind.Quite a few people think it bad after reading it because I think people should expect things to go differently than you planned, and that you should accept that, instead of encouraging people to change themselves or the environment as much as possible.You could accept it as the way the world works-as the way things actually are.And try to understand why that is, and follow it, as it is. This can be useful to whatever you do: whether it be how other people act at work, how politics works and how depressing the news media can be.Accept these things as they are, and try to understand why they're that way. It'll save you a lot of sadness because you'll no longer say, "Oh, I wish things didn't go bad!" If you really understand what I mean, you can try a different way to live in this world:accept, and understand.It might lead to some interesting results.
Question: What is the major reason why we feel unhappy in the writer's opinion?
Options: (A) We are never satisfied with ourselves and the environment around us. (B) When we see something that makes us unhappy, we don't know what to do. (C) We feel hard to accept the way things happen themselves. (D) No matter how happy we are, we never want to be happy.
[EX A]:
C