Definition: 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".
Input: He is moving his legs, stretches back and takes off. He runs fast fast down the strip and quickly leaps into the sand. then he <sep> (A) goes back to start over and does it a few more times. (B) is flip in the air, and lands into a sand pit. (C) takes off on a race track. (D) is walking in the sand, running n skate from the crowd.
Output:
A