Final answer:
Dim your high-beam headlights to low-beams within 500 feet when a vehicle is approaching to ensure road safety and avoid glare. So, the correct option is C) 500
Step-by-step explanation:
When you see a vehicle coming towards you, you should dim your high-beam headlights to low-beams within 500 feet to avoid blinding the other driver.
It's important to switch from high beams to low beams in this situation for safety reasons, ensuring both you and the oncoming driver can see the road clearly without being impeded by glare.
This practice is part of responsible driving and adhering to road safety rules.
Therefore, the correct option is C) 500