In general, what happens as the center of gravity of a truck increases?

When the center of gravity of a truck increases, it shifts the balance of the vehicle higher, making it more susceptible to tipping over, especially during maneuvers such as turning or abrupt movements. A higher center of gravity means that there is a greater potential for the vehicle to roll over, particularly when cornering at high speeds or when encountering uneven surfaces. This relationship between center of gravity and stability is critical for vehicle handling, as a higher center of gravity often leads to reduced stability and an increased risk of rollovers.

The other options do not accurately reflect the impact of a higher center of gravity. For instance, an increase in the center of gravity would generally lead to a decrease in handling stability and might even increase braking distances due to the vehicle's higher tendency to sway during deceleration. Therefore, the correct answer highlights the increased risk of rollover as the center of gravity rises.