Q: 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".
A man in shorts is in a gym. He is jumping rope in there. He speeds up his jumping. he <sep> (A) jumps over another man in the gym. (B) heads back and forth as he jumps. (C) gets off the stand and walks towards a mat. (D) is doing it in front of a mirror.
A:
D