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: A man in a green t-shirt talks to the camera while standing next to a rock climbing wall interspersed with still shots of the wall and the wall elements (ropes, labels). a man <sep> (A) is shown climbing the wall while strapped into a protective harness. (B) rolls cellophane in several layers along the wall along with a rod and grind of paper along the wall. (C) is sitting down in front of the wall on a wooden chair on the look-out board outside the rock climbing wall. (D) talks and numbers on a green wallphone as someone holds a pipe.
Output:
A