A、He wants his students to be on time for class. B、He doesn’t allow his students to tell jokes in class. C、He is always punctual

M:This is hopeless. These figures still don’t add up right. Let’s do the calculations over again.
W:Yes, but why not do them tomorrow? It’s very late now.
Q:What does the woman suggest they do?

M:Ah-ah, 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.
Q:What can be inferred about Professor Clark?