Read the excerpt from "Ghost House." The whippoorwill is coming to shout And hush and cluck and flutter about The most likely reason Frost includes assonance in these lines is

Assonance is the repetition of vowel sounds in nearby words. In the second line, “hush,” “cluck,” and “flutter” repeat a short, relaxed vowel sound, giving the phrase a musical quality. This creates pleasing sounds in the second line, so choice C is correct.

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