Sentences with errors in parallel structure have

A. the same verb tense throughout.

B. only one of five key structure words

C. conflicting tense and structure.

D

incorrect directions for driving.

Sentence with errors in parallel structure have conflicting tense and structure. The correct answer is option C. In order for the sentence to be parallel, the grammatical tenses, words and structures chosen should be uniform all throughout the sentence or the paragraph.