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".

Water is rushing between rocks in a river. rafters <sep> (A) are cheering as they dive into the water after a trout is caught. (B) are climbing the side of the rocks in the water. (C) stand on rocks on the edge of a cliff. (D) appear, paddling through the rushing currents.
D