When choosing extinguishers to fight a Class "B" fire do NOT use __________.
Official USCG Answer & Rule Citation
Correct Answer: Option D — water (cartridge-operated)
Water-based extinguishers introduce solid streams or droplets that cause burning oil to splatter, severely worsening a Class B fire. Per 46 CFR, water must never be used on flammable liquid fires due to the extreme risk of spreading.
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