Which road sign is used to indicate a school zone?

Answer: C — School zone sign

The school zone sign is specifically designed to alert drivers that they are entering an area where children may be crossing the road, usually near schools. This sign typically features a symbol of two children walking and is often accompanied by a warning about reduced speed limits in that area. It serves to remind drivers to be extra cautious and vigilant, as children's safety is a priority. Other signs such as yield and stop signs serve different purposes; yield signs indicate the need to give way to other traffic, while stop signs require drivers to come to a complete stop at intersections. Speed limit signs indicate the maximum speed allowed on a road but do not specifically denote areas where extra caution for children is necessary. Therefore, while all these signs are important for road safety, the school zone sign uniquely marks locations where the presence and safety of children are a primary concern.