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".
Input: They begin to head down the slope until they reach the end and are able to stop themselves. after that <sep> (A) there are three more teenagers struggling to retrieve the piece of rope and one climbs higher and higher to reach the top. (B) they are able to climb up some stairs and get back on the roller and continue talking about their day. (C) , they get out of their tubes and begin to exit. (D) , another group of people line up on the road while the other team joins in.
Output:
C