Final answer:
When transitioning from a paved road to an earth road, it is true that one should slow down to maintain vehicle control and ensure safety, therefore, the answer is A. True.
Step-by-step explanation:
The question is addressing the appropriate driving behavior when transitioning from a hard-surfaced pavement to an earth road or a lower quality surface. The correct action when encountering this change in road condition is to slow down. This is because the transition from a smooth to a potentially more uneven or slippery surface could affect the vehicle's traction and handling. Decreasing speed will help maintain control of the vehicle and ensure safety. Therefore, the answer is A. True.
Examples of this concept can be seen in other contexts such as physics and engineering, where different surfaces impact frictional forces and thus affect motion. Similarly, the concept of adjusting to changing conditions for safety is also relevant in health education.