Which traffic sign indicates that a driver must come to a complete stop?

Answer: B — Stop sign

The stop sign is universally recognized as the signal for drivers to come to a complete stop. This sign is typically shaped like an octagon and is often colored red with white lettering. When a driver approaches a stop sign, they are legally required to halt their vehicle completely before proceeding, regardless of traffic conditions. This ensures that drivers yield the right-of-way to other vehicles and pedestrians at intersections, enhancing overall safety on the road. Other signs, while important for safe driving, convey different instructions. For example, a yield sign advises drivers to slow down and give way to oncoming traffic, but it does not necessitate a full stop in every situation. Caution signs are designed to alert drivers to potential hazards ahead, such as curves or road work, rather than mandating a specific action. The do not enter sign indicates areas where vehicles are prohibited from entering, but it does not instruct vehicles to stop; rather, it warns drivers to turn around. Thus, the stop sign uniquely requires a complete halt, ensuring the safety of all road users.