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 talking in front of a giant swimming pool. Swimmers are shown swimming under and above the water. they <sep> (A) turn flips under water, and the man talks about their technique. (B) dive under the water in unison, more swimmers stomping on the bottom. (C) flip and dive off the side. (D) talk and pose for the camera.
A