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 stands in front of a counter with his hands down in front of equipment. He uses the surface to rub a knife blade back and forth, sharpening it. when he <sep> (A) 's done, he shows off a close up shot before throwing in a print and showing the finished product. (B) is finished, he begins cutting the knife in half. (C) is finished, the object in question is a cylinder. (D) is done, he checks the blade before lying the knife back down.
Output:
D