D) He could hit the brakes on his scooter, try to skid to a stop, and avoid the little girl's lemonade stand he saw ahead.
Explanation:
A parallel structure is the repetition of a grammatical form within a sentence.
Sentence D shows the repetition of a bare infinitive:
the sentence has three bare infinitives (hit, try, avoid) used with the modal verb could.
Hope this helps.