Can you safely remove the radiator cap whenever the engine is running?

Answer: C — No, it's unsafe to remove while running

Removing the radiator cap while the engine is running is unsafe because the cooling system is pressurized. When the engine operates, the coolant heats up and expands, creating high-pressure steam and hot coolant that can cause severe burns or scalding injuries if released suddenly. It is crucial for safety to only remove the radiator cap when the engine is off and has cooled down sufficiently to relieve that pressure. This practice helps prevent accidents and injuries associated with exposure to the hot coolant and steam.