Rose must have been sleeping; otherwise, she would have heard the telephone ring.

A. Rose was sleeping so deeply that she wouldn’t even have heard telephone ring.

B. The telephone rang while Rose was about to fall asleep, but she wasn’t aware of it.

C. I’m pretty sure that Rose was asleep at the time, because she didn’t hear the telephone ring.

D. If she had been sleeping, Rose would have missed the sound of the telephone.