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Which of the following materials can be used in a Class A:B:C fire extinguisher to put out these types of fires?

A Dry chemical agent
Explaination
When used properly, multipurpose dry chemical agents can safely extinguish Class A (wood, paper, and other combustibles) fires, Class B (flammable liquids and gases) fires, and Class C (electrical) fires. Carbon dioxide doesn't work well on Class A fires. Water should never be used on Class C fires because it's electrically conductive.
B Carbon dioxide
C Water