In television programming, a later viewing time often--a more--audience and, therefore, more challenging subjects and themes.
A. requires.. critical
B. evinces.. affluent
C. implies.. mature
D. eliminates.. realistic
E. invites.. general

Why mature? Why can only "mature people" watch the challenging theme programs?
It just means the kids are in bed!
Ah?! Thank you NTB. So it has nothing to do with the "challenging theme"?