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".
Q: Then he places materials underneath the carpet underlay. He puts a wooden slat in the door entrance. He picks the slat up. He cuts the slat. he <sep> (A) shows how to tighten and swing it further until it pierces the wall. (B) finishes the roofing with a tool. (C) lays the slat down again. (D) is waving his life away in rictus eyes.
A:
C