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: We have only one earth.In a world with limited land, water and other natural resources, the harm from the traditional business model is on the rise.Actually, the past decades has seen more and more forests disappearing and globe becoming increasingly warm.People now realize that this unhealthy situation must be changed, and that we must be able to develop in sustainable ways.That means growth with low carbon or development of sustainable products.In other words, we should keep the earth healthy while using its supply of natural resources. Today, sustainable development is a proper trend in many countries.According to a recent study, the global market for low-carbon energy will become three times bigger over the next decades.China, for example, has set its mind on leading that market, hoping to seize chances in the new round of the global energy revolution.It is how trying hard to make full use of wind and solar energy, and is spending a huge amount of money making electric cars and high-speed trains.In addition, we are also seeing great growth in the global markets for sustainable products such as palm oil , which is produced without cutting down valuable rainforest.In recent years the markets for sustainable products have grown by more than 50%. Governments can fully develop the potential of these new markets.First, they can set high targets for reducing carbon emissions and targets for saving and reusing energy.Besides, stronger arrangement of public resources like forests can also help to speed up the development.Finally, governments can avoid the huge expenses that are taking us in the wrong direction, and redirecting some of those expenses can accelerate the change from traditional model to a sustainable one. The major challenge of this century is to find ways to meet the needs of growing population within the limits of this single planet.That is no small task, but it offers new chances for sustainable product industries.
Question: The traditional business model is harmful because of all the following EXCEPT that _ .
Options: (A) It makes the world warmer (B) it consumes natural resources (C) it brings severe damage to forests (D) it makes growth hard to continue

Ex Output:
B

Ex Input:
Article: One summer night Ludwig Beethoven took a walk in the suburb of Bonn. Suddenly a gentle wind came. He heard some music. He listened carefully and found it was his F sonata. He followed the music and came to a small house. There through the window, he saw a girl playing a very old piano and a young man was making shoes beside her, he pushed the door open and went in. The host received him very warmly and told him that the girl was his sister, who was blind but very fond of music. They couldn't afford to send her to a master. So she was only trying to play some music she heard the neighbors play. She knew it was the work of a great composer. Beethoven was very much moved. Suddenly the candle was blown out. Moonlight struck on the girl's slender figure. Then Beethoven played music for them. He played so wonderful that the brother and sister were amazed. That was his famous Clair de lune.
Question: Beethoven heard the music because _ .
Options: (A) it was played loudly (B) there was a slight wind (C) the piano was old (D) he stopped walking

Ex Output:
B

Ex Input:
Article: It is said that usually people learn from their experiences and the mistakes they make throughout their lives. This is correct because life teaches us what is correct to do and what is not. Let's consider a mistake that one has made while trying to learn to drive. It is true that, for a beginner, it is common to make mistakes, but after doing something wrong once, twice or three times, it is quite impossible to make the same mistake a fourth time. Everyone tries their best in order to improve their skills and they will be very pleased to notice that these improvements really happen. On the other hand, being successful in everything he does, one cannot know what failure means. He would always see only the best side of things and it would be difficult for him to face the difficulties to come in the future. Here we can mention the case of a very successful football player, who has known what fame is from the very beginning of his career. We have to admit that most of his luck originates from the great talent that he was born with. But some fellow players can also work to achieve the same thing because they make mistakes in their games and they learn from each mistake that they make. In the end, we can say that one needs to make mistakes in life in order to better appreciate things. And at the same time, mistakes teach us how important it is to fight for something we wish for in life. Of course, moments of happiness will come in return when we see the changes or improvements.
Question: What is the author's attitude towards someone that is always successful at something?
Options: (A) He thinks they are lucky. (B) He is bored with them. (C) He wants to learn from them. (D) He believes their success is a bad thing.

Ex Output:
A