"Guests" and "met" the words that Coleridge used to create assonance. Option B is correct.
Assonance is a literary device in which the sounds produced by vowels within a sentence or phrase are repeated. In this regard assonance can be understood to be a type of alliteration. So, a resemblance in the sounds of words or syllables is achieved with this literary device. In this case both words contan an "e", so that the sound is repeated.