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 sat on a bench by the piano. The man press the key on the piano. the man <sep> (A) play the piano, then his fingers moved up and down in the piano. (B) push the keys on the piano. (C) spun his stick on the piano keys then tune a song. (D) started to play the piano with both of his hands.
Student:
D