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 is climbing up the stairs of a play gym, he stops once and points at a red tube opening but passes it. he <sep> (A) climbs to the top, grabs the tube and is pulled down the stairs. (B) gets to the red tube slide at the top and points to it and then slides down. (C) throws a rock up into the tube but it never goes far enough. (D) shows a door with several signs that say " access to your home ".
Output:
B