You will be given a definition of a task first, then some input of the task.
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".

Two people are kayaking down a rough river. now only one person <sep> (A) is moving in the kayaks. (B) is wearing ski equipment. (C) has water on his kayak. (D) can be seen going by the rocks.
Output:
D