Parallel structure is the repetition of

Awords, phrases, or sentences that have the same grammatical structure
Ba theme in several different selections by one author
Cwords, phrases, or sentences that have different grammatical structure
Dvowel and consonant sounds in words that are close together

Verified Answer :

Parallel structure is about the same grammatical structure being used at multiple places in the text. The correct answer is:  a) words, phrases, or sentences that have the same grammatical structure

The correct answer is A.) words, phrases, or sentences that have the same grammatical structure.

This is because Parallelism is the repetition of words and phrases to clarify, increase understanding, and emphasize importance