Given the task definition and input, reply with output. 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 crouching on the ground. He is next to a stationary bike. he <sep> (A) measures and unties the bike as he looks at his phone. (B) begins to show how to mount the bike, working hard. (C) begins to work on the bike with tools. (D) reaches into a bag, pulls out a canvas covered in paint, then sets it on the ground.
C