An EMS vehicle is approaching your bus just as you are stopping to unload students. You should
A. unload students quickly and tell them to stay on the side of the road.
B. keep the students on the bus and keep your warning lights activated.
C. keep students on the bus, keep the warning lights activated, and wave the EMS vehicle to pass.
D. keep the students on the bus, deactivate the warning light system, and activate the hazard lights.