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 is wearing a pair of boxing gloves. he <sep> (A) is hitting a large punching bag. (B) comes at the man back to back. (C) then demonstrates punching and kicking. (D) lifts his body over his head, flipping forward and back down.
A:
A