What should a driver do if an emergency vehicle is approaching with its lights and siren on?

Answer: B — Pull over to the right and stop

When an emergency vehicle approaches with its lights and siren on, the appropriate and safe response is to pull over to the right side of the road and come to a complete stop. This action allows the emergency vehicle to pass through traffic unhindered and promptly reach the scene of an emergency. Stopping to the right is crucial because it not only helps the emergency vehicle navigate through congested areas quickly, but it also ensures the safety of all road users. Other drivers continuing to move, speeding up, or making sudden maneuvers such as U-turns can create dangerous situations, increasing the risk of accidents. By pulling over and stopping, drivers are complying with traffic laws that prioritize the swift movement of emergency responders, which can be vital in critical situations where time is of the essence.