A training passage states: 'Backdraft results when oxygen is introduced into a superheated, oxygen-depleted environment. Warning signs include smoke pushing in and out of openings and discolored smoke.' What condition triggers a backdraft?
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A
Introduction of additional fuel into a burning structure
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B
Introduction of oxygen into a superheated oxygen-depleted space
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C
A sudden drop in ambient temperature inside the structure
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D
Activation of the building sprinkler system