The sentence sets up a parallel structure:
We’re looking for:
(i) a verb meaning
demonstrate or prove(ii) a word contrasting with
dystopian fantasy, meaning something ordinary or everyday
Blank (i)A. attest to: It means to provide evidence of; to demonstrate. This fits
B. belie: means to contradict or misrepresent. Not fit
C. gainsay: means to deny or dispute.
The correct choice is
A. attest to, since the novels demonstrate his ability.
Blank (ii)D. ebullient: means enthusiastic or lively. Not correct
E. quotidian: It means ordinary, everyday. Correct
F. fantastical: means imaginary or fantasy-based. Not correct
Since mainstream novels would depict the ordinary world (in contrast to dystopian fantasy), the correct choice is
E. quotidian.Answer: A,E