Dry chemical extinguishers extinguish class B fires to the greatest extent by __________.
Official USCG Answer & Rule Citation
Correct Answer: Option C — breaking the chain reaction
Dry chemical agents (such as monoammonium phosphate or sodium bicarbonate) primarily extinguish Class B fires by chemically interrupting the combustion chain reaction (inhibiting free radicals), alongside minor smothering and cooling effects.
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