This classification of fire involves ordinary combustible material.

• A. Class A
• B. Class B
• C. Class C
• D. Class D

Answer: (A)

Fires involving ordinary combustibles are Class A. This group covers materials such as wood, paper, cloth, rubber, and many textiles, which burn and leave ash as they oxidize. The defining approach to extinguishing Class A fires is cooling with water or other agents that remove heat, since lowering the temperature below the material’s ignition point stops the flame progression. Other classes exist for different fuel types: Class B covers flammable liquids, Class C covers energized electrical equipment, and Class D covers certain combustible metals. These distinctions are why the ordinary-combustible category fits Class A, guiding both extinguishing methods and fire behavior considerations.