If the options are metaphor, alliteration, allusion, and apostrophe, I believe the answer is metaphor, because the others don't fit.
Alliteration is the repetition of a consonant.
Allusion is reference to something or somebody outside of that literary work.
And apostrophe is the author speaking directly to somebody outside the poem, usually gods or a muse.
Peace it lacks proper subject verbs,adverbs <span />
Answer: The rhythm is consistent, and Poe celebrates the consistent relief of his dreams.
In this excerpt of "Dreams," Poe is able to achieve a consistent rhythm by linking the verses. When read aloud, one verse flows easily to the next because they consist of incomplete sentences. This consistent rhythm resembles the consistent relief of his dreams.
