The answer would be B, word choice!
The correct asnwer to this question is 1 3 and 4 or
It shed light on the benefits of slavery.
It ignored the unique cultures of different regions of the country
It mirrored the somberness of postwar America with a new realism.
The mood of the poem is sad and dark, describing where the bones of someone's father are laying (at the bottom of the ocean.). Alliteration helps convey this mood because the repetition of sounds, especially the 'f' and 's' sounds, make a sound that resembles the rush of waves or the sound you hear if you're underwater.
The first example is in the first line, the 'f' sound is repeated in "Full Fathom Five thy Father lies". Then, for a second example, in lines 4-7, the 's' sound is repeated in "Suffer a Sea-change / Into Something rich and Strange. / Sea-nymphS". Again, those two sounds represent the sound and feeling of being underwater where the body is resting.
