Honestly, I had gotten this question several times when I was interviewing. Their main goal for this question is to see how determine you are and if you can improve your application if you don't get in.
Detroit has a really large waitlist, and the chances of getting out of the waitlist is high, since a lot of students withdraws their application or were accepted somewhere else. As Dr. Jeffers said during the interview, that 200 people got off the waitlist out of 220-240? Don't give up yet!
doubt 200 off waitlist.