Final answer:
When driving, you should always carry your driver's license, vehicle registration, and proof of insurance, as they verify your ability to operate a vehicle legally and responsibly.
Step-by-step explanation:
The three documents that should be kept with you at all times while driving are: A. Driver's license, registration, and insurance. It is essential for drivers to have these documents readily available as they serve as proof of the legality and responsibility of the driver to operate a vehicle. The driver's license confirms your identity and that you have passed the required tests to drive. The registration shows that the vehicle you are driving is legally registered, and insurance documents prove that you have the necessary coverage to handle any potential accidents or issues encountered on the road.