Definition: 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 dog who is missing his front legs <sep> (A) is being held by a person from behind as he tries to legs free. (B) is sweeping the floor in a room in the back of a store. (C) is walking across a lawn. (D) has his front paw over his mouth and he manages to get off the floor.
Output:
C