The poetic device that Poe uses in the above line is Alliteration.
The correct option is B.
Alliteration is a literary device in which words with the same consonant sound or syllable occur. It gives a poem a different and a unique rhythm. In the above line the words “swung” and “Seraphim” with sound 's', the words “foot-falls” and “floor” with sound 'f' and the words “tinkled” and “tufted” with sound 't' are the examples of alliteration.
