The novel's protagonist, an anti-hero whose moral compass was undeniably ______, nevertheless captivated readers with his compelling internal struggles and eventual, if reluctant, redemption.

✓ Correct Answer: Option C

An 'anti-hero' with 'internal struggles' and 'reluctant redemption' suggests a wavering or unpredictable morality. 'Capricious' means given to sudden and unaccountable changes of mood or behavior, fitting this characterization.