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: He is timing himself as he attempts to solve the cube. He moves quickly, solving them in short time. he <sep> (A) tries again, showing the cube corners and distances. (B) takes a break, breathing heavily from the effort. (C) clenches his fists with joy. (D) stops the cube and plays again.
Student:
C