Answer:
feedback
Step-by-step explanation:
Based on the scenario being described within the question it can be said that the individuals that test-drive the vehicles are the feedback. In the communication method this refers to the audiences response that allows "you" as a company to evaluate the effectiveness of your message, product, or promotion. Which in this specific scenario the people that test-drive the car allow you to understand what they like and dislike about the cars in order to improve on it and sell more.