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 person is on a slack line and doing trucks. The person falls backward off of the slack line. two people <sep> (A) places ladders next to them. (B) almost fall when they walk through the slack line. (C) are playing on a slack line and one of them flies off and falls on the sand. (D) are on the side of a trailer.
C