In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D". 

Example Input: [header] How to stay young [title] Challenge yourself to try new things. [step] Go out dancing, joining a book club or a hiking club, or try out for a community chorus. Singing, dancing, and finding new ways to stay active all contribute towards keeping a youthful outlook on life. <sep> (A) Here are some things to take into account : [substeps] Spend less time studying or practicing. Read only the books you are interested in, do not read video games, and do not browse old magazines or websites. (B) [substeps] Don't be afraid to laugh at yourself. Trying new things with joyfulness raises your levels of dopamine and energy levels. (C) [substeps] Try a fun game like punch or catch. Then, in the morning, you'll feel fresh and energized, and all your racing thoughts will be washed away. (D) If you can, challenge yourself to put in hours or weeks into each of these activities. Try hard but don't give up if you cannot help someone in need.
Example Output: B

Example Input: A large group of people are seen playing instruments with one another. the camera <sep> (A) pans around the audience and shows the audience shaking hands. (B) pans around to show many people leading in front and the drummer leading in front. (C) follows a bull that ties up a man on the ground. (D) zooms in on a man playing a violin.
Example Output: D

Example Input: [header] How to build an outdoor classroom [title] Get a group of students together and decide what type of outdoor classroom you want at your school. [step] Types include: near or in a prairie, in the school's courtyard, off trail, in a wooded area, in a green house, or any other area your school deems suitable. [title] Ask a teacher to mentor your outdoor classroom project. <sep> (A) [step] You can or may write a simple query letter and send it to the teacher (s). The teacher will/should follow up on the query letter, when he/she has time, and should report back to you. (B) [step] The teacher will know of any school protocols you will need to follow and will be able to facilitate contact with your school's administrators. A teacher may also have access to funding to help your outdoor classroom get started. (C) [step] Your teacher should have a background in creating this project and have talked to the several different teachers about it. Since they have worked on many projects-including outdoor buildings-they might be familiar with it. (D) [step] If the classroom gets crowded, make sure you supply lots of benches, teachers' chairs, classroom equipment, picnic tables, and so on. [title] Start a fun outdoor classroom activity that everyone will be participating in.
Example Output:
B