Which document must you have with you while driving?

Answer: C — valid driver's license

A valid driver's license is a fundamental requirement for anyone operating a vehicle on public roads. It serves as proof that a driver has completed the necessary training and testing to safely operate a vehicle, demonstrating that they understand the rules of the road and can navigate safely in various driving conditions. Without a valid driver's license, you can face legal penalties, including fines or the potential for your vehicle to be impounded. While having an insurance card and vehicle registration is also important, they are supplementary to the requirement of having a driver's license. An insurance card verifies that you have the necessary coverage to drive legally, and vehicle registration indicates that the vehicle is legally entitled to be on the road. A passport, while a valid form of identification, does not grant you the authority to drive. Therefore, a valid driver's license is the most crucial document to carry while driving.