What should happen anytime the bus is in motion?

When a bus is in motion, it's essential for safety that headlights are on and doors are closed. This requirement ensures the bus is visible to other drivers, especially in low-light conditions or inclement weather, enhancing overall safety on the road. Additionally, keeping the doors closed prevents passengers from accidentally falling out or being injured while the bus is moving.

The option regarding cell phone use is not appropriate since it can distract the driver and is generally prohibited in commercial driving, particularly when transporting passengers. The statement about seatbelts being optional is incorrect because, in most jurisdictions, including California, wearing seatbelts is mandatory for the safety of all passengers. Closing the windows might be advisable in certain situations for safety reasons, but it is not a strict requirement when the bus is in motion.