Parallel structure (also called parallelism) is the repetition of a chosen grammatical form within a sentence. By making each compared item or idea in your sentence follow the same grammatical pattern, you create aparallel construction.
D, a train or a big truck.
"At first I was sure that a train or a big truck was directly behind the car."
Answer:
Person vs person vs society
She said to me is the answer you are searching for.