How far must the reflectors on a vehicle be visible from?

Answer: C — 500 feet

The reflectors on a vehicle must be visible from a distance of at least 500 feet. This requirement is in place to ensure that the vehicle can be seen by other drivers under low light or poor visibility conditions. The effectiveness of reflectors plays a crucial role in safety, as they serve to alert other road users about the presence and position of the vehicle, helping to prevent accidents. While the distances noted in the other choices vary, none meet the minimum safety standard set for reflectors, emphasizing the importance of proper visibility to enhance road safety for all users. It's essential for drivers to be able to see reflectors from a significant distance, particularly in situations like nighttime driving or in inclement weather, where visibility may be further compromised.