Parallel structure uses

a: different tense within verb structure.
b: one of five key structure words.
c: the same tense and structure.
d: detailed driving directions in writ

 If you are asking what parallel structure looks like, you would have to keep the verb tenses and the sentence structure the same.  For example, Sam likes to ride bikes, hike trails, and bake bread.  What is does NOT look like: Sam likes to ride bikes, go hiking on trails, and baked bread with her grandmother.  The structure would be based off the passage you are given. If you were asked to write a paragraph using a parallel structure, follow the example given here.

what is the passage