D: When you get into the car, first buckle your seatbelt and then proceed with driving.
Explanation:
A parallelism is a rethorical device in which a structural pattern is repeated , or the grammatical pattern is similar, for example: <em>I came, I saw, I conquered </em>(all the verbs are in the simple past). The problem in this sentence is that it uses one verb in the infinitive (to buckle) and the other in present participle (proceeding). The correct is: buckle/proceed
