The sentence that has an error in parallel structure is:
C Margaret could not believe that the corrupt cop wrote her a ticket, he spoke to her rudely, and he kicked her car tires as he left.
The three clauses should have a consistent grammatical structure. A corrected version could be: "Margaret could not believe that the corrupt cop wrote her a ticket, spoke to her rudely, and kicked her car tires as he left." This keeps the verbs in the same format.