A passage reads: 'Flashover occurs when all combustible materials in a compartment reach their ignition temperature simultaneously, resulting in a sudden full-room fire. Warning signs include rollover, extreme heat at floor level, and blackened windows.' Which condition is listed as a warning sign of an impending flashover?
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A
Visible flames from the exterior
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B
Extreme heat felt only near the ceiling
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C
Blackened windows
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D
Sudden loss of water pressure