Definition: 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 woman is standing on an elliptical machine. she <sep> (A) pushed the red button. (B) - she is doing rows of pumps in the gym. (C) starts working out on the machine. (D) pushes the chair back and starts doing exercise on it.
Output:
C