Final answer:
The word that best completes the sentence is truculent.
Therefore, option D is correct.
Step-by-step explanation:
The word that best completes the sentence is TRUCULENT.
Truculent means aggressive, fierce, or cruel. In this context, it implies that the response was overly harsh and aggressive towards the person who only caused a small damage to the car.
For example, if someone lightly bumped into another person's brand new car and the owner responded by shouting and insulting them, that would be a truculent response.