Read the excerpt from The Last Lecture.

So I called up my mentor, and I called up Andy Van Dam. And I said, Andy, I just gave a two-week assignment, and they came back and did stuff that if I had given them a whole semester I would have given them all As. Sensei, what do I do? [laughter] And Andy thought for a minute and he said, you go back into class tomorrow and you look them in the eye and you say, "Guys, that was pretty good, but I know you can do better.” [laughter] And that was exactly the right advice. Because what he said was, you obviously don’t know where the bar should be, and you’re only going to do them a disservice by putting it anywhere. And boy was that good advice because they just kept going. . . .

Based on this excerpt, Randy Pausch believes that his students

A)need strict limits in order to succeed.
B) are capable of completing any task.
C) possess a great deal of potential.
D) often change their life goals.