Final answer:
Option 2 ('I celebrate myself and sing myself,/And what I assume you shall assume') from Walt Whitman's 'Song of Myself' demonstrates parallelism with its repeated structures and mirrored phrases.
Step-by-step explanation:
Parallelism in Poetry
Parallelism in literature is a rhetorical device characterized by the use of similar grammatical structures in two or more parts of a sentence. It enhances the readability and aesthetic appeal of prose or poetry. Looking at the given options, Option 2 is an example of parallelism: 'I celebrate myself and sing myself,/And what I assume you shall assume'. This line from Walt Whitman's 'Song of Myself' exhibits parallelism through the repetition of structure in the phrases 'I celebrate myself' and 'and sing myself', as well as in the mirrored assumption in 'what I assume you shall assume'. This literary technique provides emphasis, rhythm, and a sense of balance to the lines, making them particularly memorable and musical.