On a MODU, the possibility of a blowout makes which type of diesel engine shutdown desirable?

Correct Answer: Option D — Air inlet shut-off valve

In a blowout scenario, combustible gas can be drawn into the engine's air intake, causing the engine to overspeed and potentially explode. An air inlet shut-off valve provides a positive means to starve the engine of oxygen, ensuring an immediate and reliable emergency shutdown regardless of fuel supply.