Read the following conversation and answer the question.

M: Ah, er! Looks like I'm going to be a little late for class. I hope Professor Clark doesn't start on time today.

W: Are you kidding? You can set your watch by the time he starts his class.

Question: What can be inferred about Professor Clark? 

- He wants his students to be on time for class.

- He doesn't allow his students to tell jokes in class.

- He is always punctual for his class.


He is always punctual for his class.