What should a driver do when approaching a school bus with its stop sign extended?

Answer: C — Come to a complete stop

When approaching a school bus with its stop sign extended, the correct action for a driver is to come to a complete stop. This requirement is in place to ensure the safety of children who may be getting on or off the bus. The extended stop sign indicates that students are in a vulnerable position, and by stopping, drivers help to create a safe environment for these children. This law is particularly important because children can be unpredictable and may suddenly dart into the street. By stopping, drivers give these children the necessary time and space to cross safely. It's essential for all drivers to be aware of these regulations, as failing to stop can lead to serious accidents and hefty fines. Therefore, when the stop sign is out and the lights are flashing, the appropriate response is always to stop completely and wait until the bus resumes its route and the stop sign is retracted before continuing to drive.