Which of these passages from Inaugural Address is an example of a structure that is parallel in how the phrases are arranged?

Hello. You did not enter the answer options, but we can say that an excerpt from Inaugural Address that has a parallel structure in the sentence organization is:

"we shall pay any price, bear any burden, meet any hardship, support any friend, oppose any foe."

Explanation:

The parallel structure, in a text, occurs when the author uses a group of words (or a group of phrases) in sequence, in the same sentence (or in the same paragraph), which have the same grammatical structure. This literary device is used when the author wants to emphasize something very important for his text.

In "Inaugural Address" we can see that Kennedy used this feature in the sentence: "we shall pay any price, bear any burden, meet any hardship, support any friend, oppose any foe."

i may be wrong but i think your answer is flashback