When refuelling, it is mandatory to...
A)stop the engine and turn on the hazard warning signal.
B)stop the engine and roll up the vehicle's windows.
C)stop the engine and turn off the vehicle's lights.Correct
# Refuelling
When refuelling, it is mandatory to **turn off the engine** as a fundamental safety measure to avoid the risk of fire or explosion. In addition, all vehicle lights must be turned off, since any spark or ignition source could be dangerous in the proximity of flammable vapours. These measures ensure the safety of both the driver and other petrol station users.