Instructions: 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: People walk holding surfboards, then they board a boat. a man water ski <sep> (A) behind the boat jumping high and spinning. (B) on calm river and falls. (C) on a lake, then enter in front of a water boat holding a pair of oars on the board. (D) and take a break.
Output:
A