Detailed 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".
Problem:He has several rubik's cubes in a row. He is timing himself as he attempts to solve the cube. he <sep> (A) shakes his head as a then solves the cube in several quick seconds. (B) moves quickly, solving them in short time. (C) uses the timer to give him more minutes. (D) finishes and sets the watches timer.
Solution:
B