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

Answer: C — Stop and wait for the bus to move

When a driver sees a school bus with its stop sign extended, the appropriate action is to stop and wait for the bus to move. This is crucial for the safety of children who may be entering or exiting the bus. The extended stop sign signifies that children may be crossing the road, and stopping ensures they have a safe environment to do so. It's a legal requirement in many states, including Texas, to stop your vehicle when the bus is stationary with its stop sign displayed. This helps protect the most vulnerable road users—children—and reinforces traffic laws designed to enhance safety around school zones. While slowing down and proceeding carefully might seem reasonable, it does not provide the necessary safety measure that stopping does. Continuing to drive at the same speed poses a significant risk to children, and honking the horn does not contribute to safety in this situation; rather, it could startle children or distract them. Therefore, coming to a complete stop is the critical and legally required action.