Given the task definition and input, reply with output. 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 belly surfing as a wave arrives. he <sep> (A) throws his right arm in the air before the wave knocks him backwards. (B) stands up on his surfboard and rides the waves. (C) stands up swimming in the water. (D) gets almost near the camera and takes a breath wet with water, doing acrobatics in the water.
B