Final answer:
The answer to the question is D) At a safe distance based on your vehicle's speed, which means maintaining enough distance to react and stop when necessary, taking into consideration your speed and the applicable physics of motion.
Step-by-step explanation:
When following a truck, it's important to stay at a safe distance based on your vehicle's speed. The correct answer is D) At a safe distance based on your vehicle's speed. You should stay far enough behind the vehicle so that you can see the truck's side mirrors, which indicates that you are not in the truck driver's blind spot. However, the fundamental rule is to maintain a distance that allows you enough time to react and stop if necessary, which varies with your speed.
For example, if you're traveling at higher speeds on a highway, you'll want to stay several car lengths behind the truck to ensure you have adequate stopping distance. This concept is crucial as it relates to the physics of motion, where the stopping distance of a vehicle is proportional to the square of its speed. Thus, as speed increases, the distance required to stop safely increases dramatically.