I agree with the person above, the correct answer is C) clarify an argument. Alliteration is repetition of consonants in words. It is used to establish a rhythm, emphasize an idea, and impart a musical quality.
Alliteration is a device that is basically of form or syntactic. That makes the purpose of establishing a rhythm and imparting musical quality kind of obvious. Why are they used? To emphasize an idea. On the other hand, Clarifying an argument would need a device that focuses more on semantic or meaning.
