When should a driver stop the bus to restore order?

Answer: B — When chaotic behavior occurs

Restoring order on a school bus is critical for the safety of all passengers. Stopping the bus when chaotic behavior occurs is necessary to ensure that the driver can address the situation directly. This decision allows the driver to regain control and ensure a safe environment for everyone on board. Chaotic behavior can distract the driver and could lead to unsafe driving conditions, making it paramount to stop and manage the situation effectively. While addressing passengers not wearing seatbelts is important for safety, and mechanical issues could necessitate stopping the bus for safety reasons, the primary focus here is on the immediate need to handle disorderly conduct. Thus, stopping for chaotic behavior directly addresses the concerns of safety and orderliness within the bus environment.