What must drivers do when encountering a school zone sign?

Answer: C — Reduce speed

When drivers encounter a school zone sign, they must reduce their speed to enhance safety in areas where children are present. School zones are specifically designated to alert drivers to be extra cautious and to decrease their speed, as children may be crossing the street, waiting for buses, or moving around the area. The reduced speed limit in a school zone typically applies during specific times when students are arriving at or leaving from school, which emphasizes the need for heightened awareness and precaution. By lowering their speed, drivers have more time to react to unexpected situations, such as children darting into the street or a sudden stop of a school bus. Adhering to speed limits in these zones is crucial for ensuring the safety of schoolchildren and other pedestrians.