A portable dry chemical fire extinguisher discharges by（）. A:gravity when the extinguisher is turned upside down B:pressure from a small CO2 cartridge on the extinguisher C:air pressure from the hand pump attached to the extinguisher D:pressure from the reaction when water is mixed with the chemical

A portable dry chemical fire extinguisher discharges by（）.
A:gravity when the extinguisher is turned upside down
B:pressure from a small CO₂ cartridge on the extinguisher
C:air pressure from the hand pump attached to the extinguisher
D:pressure from the reaction when water is mixed with the chemical

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