Question 1937 Deck General

The correct answer is A) insure at least one complete change of air in the compartments concerned. The reasoning for this is that gasoline engines release flammable and potentially explosive vapors, so it is crucial to ensure proper ventilation before starting the engine. The exhaust blower should be run long enough to completely replace the air in the compartments and remove any accumulated vapors, reducing the risk of fire or explosion. The other options are incorrect because B) warming up the blower motor is not the primary purpose, C) checking the system's operating condition is important but not the main reason, and D) providing fresh air is important but a complete air change is the key requirement.