Why might an author use contrasting diction in a literary work?

Go, wondrous creature! mount where science guides, go, measure earth, weigh air, and state the tides; instruct the planets in what orbs to run, correct old time, and regulate the sun; which statement is correct? antithesis is used in the first two lines. antithesis is used in the last two lines. parallelism is used in the first two lines. parallelism is used in the last two lines.

Where sarah live? a. are b. is c. do d. does

Besides the revisions listed in the paragraph, what else can deepak do to strengthen his paper?