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: Homework can put you in a bad mood , and that might actually be a good thing. Researchers from the University of Plymouth in England doubted whether mood might affect the way kids learn. To find out the answer, they did two experiments with children. The first experiment tested 30 kids. Someshapes were hidden inside a different, larger picture. The kids had to find the small shapes while sitting in a room with either cheerful or sad music playing in the background. To test their mood, the scientists asked the kids to point to one of five faces, from happy to sad. Children who listened to cheerful music tended to point to the smiley faces while the others pointed to the unhappy ones. The researchers found that sad kids took at least a second less to find the small shapes. They also found an average of three or four more shapes. In the second experiment, 61 children watched one of two scenes from a film. One scene was happy, and the other was sad. Just like in the first experiment, kids who saw the sad scene acted better compared to the others. The researchers guessed that feeling down makes people more likely to focus on a problem or difficult situation. Not all scientists agree with them, however. Other studies argued that maybe, that cheerful music in the first experiment distracted kids from finding shapes. While scientists work on finding out the answers, it still might be wise to choose when to do your tasks according to your mood. After eating a delicious ice cream, for example, write an essay.
Question: Researchers did experiments on kids in order to find out _ .
Options: (A) how they really feel when they are learning (B) whether mood affects their learning ability (C) what methods are easy for kids to learn (D) the relationship between sadness and happiness
Example output: B
Example explanation: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment. So, B is the correct answer.
Q: Article: For the past four years, the Green Festival in Washington, D.C., has brought together people from around the country who are interested in the environmental movement. The groups call the festival "a party with a purpose". They say the purpose of the Green Festival is to create an economy in which natural resources are used in a way that does not destroy the environment. To the people who organize the event, "green" means having a safe and healthy community and a strong local economy. Throughout the two-day event, over one thousand people volunteered to help the festival run smoothly. Four hundred businesses and organizations showed their products and projects. About three thousand visitors came to the party. They could find everything from naturally made organic food to clothing made from bamboo plants. There were over one hundred fifty speakers and discussion groups. For example, you could learn how to be an environmentally friendly traveler. You could also watch several movies about political and environmental issues. Then you could listen to some live music performances. After sitting for too long, visitors could take a yoga exercise class. There was even an area for children. Younger visitors could enjoy fun games and lessons on subjects like protecting the rainforest and creating chocolate sweets. Green building was one of the important subjects at the festival. Many companies and organizations aim to create environmentally safe buildings. They design structures with reduced energy use, fewer chemicals and more recycled materials. The Loading Dock is an organization based in Baltimore, Maryland. Its message is that "a person could build a house with what others throw away". The Loading Dock collects donations of used building materials such as flooring, lighting, doors, and windows. These materials would otherwise end up in a landfill trash center. Then, the group resells the materials. This way, the materials are recycled. This form of recycling provides entire families and neighborhoods with low cost solutions for rebuilding their communities. Spending a day at the Green Festival showed people many solutions for improving the health of our planet. People have _ green choices, from the things people buy to the ways people eat, think, and live. The Green Festival connects a wide community of people who care deeply about, and are working to improve, our shared environment.
Question: What is the purpose of the Green Festival?
Options: (A) To bring people together. (B) To study the environment. (C) To improve people's health. (D) To develop a green economy.
A:
D