Assonance involves the repetition of:
B. a vowel sound within words.
Assonance is a literary device where the repetition of vowel sounds occurs in nearby words to create a musical or rhythmic effect in a text. This repetition can happen in stressed or unstressed syllables. An example of assonance can be found in the phrase "hear the mellow wedding bells" where the "ea" sound in "hear" and "mellow" is repeated.
This choice is correct because assonance focuses on the repetition of vowel sounds rather than emotional descriptions, consonant sounds at the beginning of words, or a single word at the end of a line.