Sources like wikipedia are most useful when you need a. background information b. information that is entirely accurate c. quotations supporting your position d. unbiased reviews of opinions

the correct answer is d. a discussion of specific uses of alliteration

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when you are critiquing or evaluating a poem, you will mostly pay attention to the theme, as well as figures of speech and rhythm. alliteration is a figure of speech where consonants are repeated in neighboring words - and it is important for analysis of sound and rhythm, which is why it might appear in the evaluation of that poem.