Teacher: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".
Teacher: Now, understand the problem? Solve this instance: A man is mopping inside an airy building. The floors shine as he moves the mop over the surface. he <sep> (A) lays out mats and leads into him cleaning the floors. (B) is then mopping outside in brisk, glasslike movements. (C) proceeds to scrub the entire floor on front the fluorescent bulbs. (D) continues mopping, making sure every inch is clean.
Student:
D