How does an inert gas system on a tanker function to prevent explosions in cargo tanks?

Correct Answer: Option D — Inert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit.

Inert gas systems introduce oxygen-depleted flue gas into cargo spaces, maintaining hydrocarbon concentrations below the lower explosive limit and suppressing oxygen levels to prevent tank explosions per 46 CFR requirements.