What class of fire involves flammable solids?

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

Answer: (A)

Fires that are fueled by solid materials—like wood, paper, or textiles—are categorized by the way the fuel exists and burns. These ordinary combustible solids are grouped as Class A. The labeling reflects the fuel form, so solids fall under Class A, while liquids are Class B, electrical fires are Class C, and combustible metals are Class D. Knowing this helps you match the fire to the correct extinguishing approach, since Class A fires are typically treated with water or appropriate dry agents designed for solid fuels.