On a class "B" fire, which portable fire extinguisher would be the LEAST desirable?
Official USCG Answer & Rule Citation
Correct Answer: Option D — Water (stored pressure)
Water stored-pressure extinguishers lack blanketing capabilities and introduce water droplets that spread burning liquid fuels. According to USCG marine safety guidelines, straight streams of water are completely ineffective and dangerous on Class B hydrocarbon fires.
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