What does the letters A, B, and C stand for in fire extinguisher classifications?

• A. A for wood/paper/trash; B for electrical; C for chemical
• B. A for chemical; B for wood/paper/trash; C for electrical
• C. A for wood; B for paper; C for trash
• D. A for wood/paper/trash; B for chemical; C for electrical

Answer: (D)

Fire extinguisher classifications tell you which type of fire the extinguisher is designed to fight. One category covers ordinary combustibles like wood, paper, and trash. Another covers flammable liquids and similar fuels. A third covers energized electrical equipment. The mapping in the question matches these categories: wood/paper/trash for the first category, chemical (flammable liquids) for the second, and electrical for the third. This alignment is why it’s the best answer. Using the correct class matters for safety—water can spread flammable liquids or conduct electricity, so different extinguishing mechanisms are used for liquids and for electrical fires. If the categories were swapped, you’d be relying on the wrong method for the fire type, which could be dangerous.