Detailed Instructions: 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".
Q: The boy falls of and gets back on the ball before he falls off again. He tries to sit on the ball but the ball rolls away. he <sep> (A) tries again to sit on the ball. (B) sits again and another boy tries to pull him back on the ball. (C) walks away and the bell rings for the homerun. (D) retrieves it and continues to sit on and fall off the ball.
A:
D