Detailed 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".
Q: The man and another begin to do some karate moves against one another but they rarely make physical contact. There is a group of men standing around them watching them. when they <sep> (A) have completed the move, the smaller boy walks to the front of the mat and they let go of each other. (B) are finished, they take all take a group photo together. (C) begin to attack each other, screaming and doing cartwheels, lights begin flashing and the men start ducking down. (D) are done, the man in gray walks off.
A:
B