What should a driver do at a stop sign?

Answer: B — Stop fully at the marked stop line

A driver encountering a stop sign must come to a complete stop at the marked stop line, if there is one, or before entering the intersection. This action is crucial to ensure safety, as it allows the driver to assess the traffic situation in all directions before proceeding. Stopping fully helps in preventing accidents with other vehicles or pedestrians who may have the right of way. Additionally, the requirement to stop applies regardless of whether there are cars present; even if the road appears clear, stopping ensures that the driver is following traffic laws and is prepared for any unexpected events. This practice enhances overall road safety by promoting vigilance and caution at intersections where visibility may be compromised.