Class B fires involve which materials?

• A. Flammable liquids
• B. Electrical fire
• C. Combustible metals
• D. Flammable cooking media

Answer: (A)

Fires are categorized by what fuel is burning. Class B specifically covers flammable liquids and gases. That’s why flammable liquids are the best answer here—the fuels like gasoline, solvents, and oils ignite and burn as vapors from liquids, not from electrical equipment, metals, or kitchen oil under most classifications. Electrical fires fall under another class, combustible metals under yet another, and while cooking oils are a flammable liquid, many codes designate them as a separate kitchen fire class, so they’re not the defining Class B example in this context. So choosing flammable liquids correctly identifies the fuel type for Class B fires.