Final answer:
The repetition of vowel sounds in poetry for auditory effect is called assonance. It serves to create a musical quality in the poem, tailoring the reader's experience and enhancing memorability. Examples of assonance include repetitive vowel sounds in phrases such as 'weak and weary' as seen in Poe's work.
Step-by-step explanation:
The term for the repetition of vowel sounds within a line of poetry for auditory effect is D) Assonance. Assonance occurs when multiple vowel sounds are in close proximity to each other within a line or passage of poetry, and it is used to add rhythm and musicality to the poem. A classic example is found in the work of Edgar Allen Poe, where he writes, “Once upon a midnight dreary, while I pondered weak and weary...”. This technique is different from alliteration, which involves the repetition of consonant sounds at the beginning of words, and consonance, which refers to the repetition of consonant sounds at the end or within words. To further illustrate, an example of assonance could be “my mouth wound itself around the soulful sounds of the poem's words.”