Explanation

This question is an excellent lesson in the principle, “Don’t add anything to your reading of the sentence that wasn’t there already.” What were you told? Just that the first short story collection had many diverse voices, and the second collection has “a ________ narrator” — in other words, just one speaker.
Therefore, you don’t know that the stories or narrator are insightful, facetious, lonely, or disingenuous.

Motley, even, sole.
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How is motley different from variegated though? Don't both mean a lot of variety?

Yes but motley in the sense of incongruously, disparate.

A is more suitable here in the context.

Regards
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kudos

plz help for second blank, can't find clue for 2nd bank..

While the author’s first collection of short stories presented a (i) _________ hodgepodge of voices, the second collection presents a remarkably (ii) _________ set of tales presented by a (iii) _________ narrator.

hodgepodge= incongruous mixture. Therefore A= motley

remarkably set of tales = must be in contrast to motley B = even

Hope this helps
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