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".

Three young men are standing and talking together about something. they <sep> (A) arrive to a room, then they begin doing karate moves. (B) walk inside the gym and are sitting on rows of chairs. (C) are shown playing the drums while three other people are online talking. (D) smile and seem to be enjoying themselves a lot.
D