A、He favours comments that include numerical support. B、He finds Marcy often makes interesting remarks in class. C、He’ s disappo

M: Marcy, from this conversation alone it becomes apparent that your attitude about participation isn’t at all what I’m looking for.
W: Sorry, Professor, I’m not really following. What are you looking for exactly?
M: Have you ever heard the expression “quality over quantity”?
W: Yeah.
M: What I’m getting at is that I don’t only expect for my students to speak up in class. I also want to make sure that you are adding quality contributions to the discussion.
W: I’m sorry, but would you mind explaining what you mean by quality participation? I obviously have different ideas about what that is.
M: Marcy, I don’t mean that your comments aren’t interesting. But basically, some comments are more relevant to the discussion than others. It’s those kinds of comments that the others can learn from.
This is what we want, obviously.
Q: What does the professor imply when he mentions “quality over quantity”?