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".
Input: A bunch of men are inside a green colored gym. they <sep> (A) each hold a little kid, shoes, duffel, and equipment. (B) are using paddles as they jump rope together. (C) are lobbing a tennis ball back and forth. (D) take off running, trying to get onto a row of sized balls.
Output:
C