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 Input:
Article: Once upon a time the colors of the world started to quarrel. Green said, "Clearly I am the most important. I am the sign of life and hope. I was chosen for grass, trees and leaves. Look over the countryside and you will see that I am in the majority." Blue interrupted, "You only think about the earth, but consider the sky and the sea. It is the water that is the basis of life." Yellow chuckled . "The sun is yellow, as well as the moon and the stars. Every time you look at a sunflower, the whole world starts to smile." Red could bear it no longer. "I am the ruler of all of you. I am blood-life's blood! I am the color of danger and bravery. I bring fire into the blood. I am the color of passion and love." Purple stood at his full height. "I am the color of royalty and power. I am the sign of authority and wisdom. People do not question me! They listen and obey." Finally Indigo spoke with determination, "Think of me and I am the color of silence. I represent thought and reflection. You need me for balance and contrast , for prayer and inner peace." The colors went on boasting , each showing off his or her own advantages. Suddenlythere came a flash of bright lightening. Thunder rolled and boomed. Rain started to pour down. The colors were scared to death. In the midst of the quarrelling, rain began to speak, "You foolish colors. Don't you know that you were each made for a special purpose, unique and different? Join hands with one another and come to me." Doing as they were told, the colors united and joined hands. From then on, when it rains, colors will stretch across the sky in a great bow of color. Whenever a rainbow appears in the sky, let us remember to appreciate one another.
Question: Why did the colors quarrel?
Options: (A) Because they often fought for some reasons. (B) Because they were not liked by each other. (C) Because they all claimed to be the best. (D) Because they all wanted to rule other colors.

Ex Output:
C

Ex Input:
Article: Most of us are the only child in our family. We have no brothers or sisters. Our family mainly _ our mom,our dad and us. We are growing up in a world differently from our parents'. And we will be the future leaders of China. Some day we have to work hand in hand with each other and make China more and more beautiful. So we must learn to love each other like brothers and sisters. It's hard to think how difficult life would be if we had a sibling(,).We never have to share anything at home. Of course, we might have cousins, but we don't have to live with them! Our parents try to give us the best, and the best doesn't need sharing between two or three children. Do we ever ask ourselves if we are spoiled? A recent study has found that many children don't know how to love others! We don'r know the value of money. We don't know how hard our parents are to support us. We don't want others to regard us as spoiled, do we? Well, why not start now to help our parents at home, share a game with one of our friends or value the opinions of our classmates, even if we don't always agree? In a word, we must learn to love each other!
Question: As Chinese teenagers, what's our duty in the future?
Options: (A) To save money (B) To learn to love each other (C) To look after our brothers and sisters (D) To make China more and more beautiful

Ex Output:
D

Ex Input:
Article: One day the employees of a large company in St Louis,Missouri returned from their lunch break and were greeted with a sign on the front door. The sign said:"Yesterday the person who has been hindering your growth in this company passed away. We invite you to join the funeral in the room that has been prepared in the gym." At first everyone was sad to hear that one of their colleagues had died,but after a while they started getting curious about who this person might be. The excitement grew as the employees arrived at the gym to pay their last respects. Everyone wondered:"Who is this person that was hindering my progress? Well,at least he's no longer here." One by one the employees got closer to the coffin and when they looked inside it they became speechless. They stood over the coffin,shocked and in silence,as if someone had touched the deepest part of their soul. There was a mirror inside the coffin:Everyone who looked inside it could see himself. There was also a sign next to the mirror that said. "There is only one person who can set limits to your growth:it is YOU." You are the only person who can revolutionize your life. You are the only person who can influence your happiness,your realization and your success. You are the only person who can help yourself. Your life does not change when your family changes,when your friends change,when your boss changes,and when your company changes. Your life changes when YOU change,when you go beyond your limiting beliefs,when you realize that you are the only one responsible for your life.
Question: The writer's purpose in writing the article is to tell us that _ .
Options: (A) the harder we work,the more successful we will become (B) our work and life are closely connected with others (C) changing our lives is down to us (D) we will have a better future if people do not hinder our development

Ex Output:
C