Question 253Safety & Environmental - Assistant Engineer

The correct answer is D) magnesium. A Class D fire involves the burning of combustible metals, such as magnesium, sodium, potassium, or titanium. These metals can ignite easily and burn at extremely high temperatures, requiring specialized extinguishing agents to effectively put out the fire. The other answer choices (A, B, C) do not represent Class D fires, which are distinct from Class A (ordinary combustible materials), Class B (flammable liquids and gases), or Class C (energized electrical equipment) fires.