OFFICIAL EXPLANATION


The correct answers are A and B.

The two characters are described as evil, deadly monsters, and both "diabolical" and "iniquitous" mean "evil." The problem with choice C is that it creates a redundancy since "infamous" means "memorably evil," and the sentence has already described the characters as memorable. Choices D, "enduring," and E,"momentous," are simply synonyms for "memorable," so they create redundancies without even implying the characters' evil natures. Choice F creates a different redundancy since "fabricated" and "literary" have similar meanings.