You will be given a definition of a task first, then some input of the task.
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 little boy playing on a jungle gym. He is climbing up a set of stairs. now <sep> (A) he runs up even higher and climbs to the top again. (B) he is at the top and he starts climbing all the way up again. (C) is sliding fast down a slide. (D) , he is being pulled up the sliding slide and on to another set of stairs.
Output:
C