The statement 'The specific agent must be matched to the specific fuel' is true for Class D extinguishing agents.

The statement 'The specific agent must be matched to the specific fuel' is true for Class D extinguishing agents.

• A. The agent must be matched to the fuel for Class A
• B. The agent must be matched to the fuel for Class D
• C. The agent must be matched to the fuel for Class C
• D. The agent must be matched to the fuel for Class B

Answer: (B)

For metal fires, the extinguishing approach must be tailored to the specific metal involved. Metals burn in ways that are unlike ordinary fuels, and many metal fires react badly with common extinguishing agents or with water. A metal-specific dry powder is designed to interrupt the chemical reaction at the metal surface, smother the flame, and prevent re-ignition by forming a protective crust or coating that isolates the fuel from heat and oxygen. Because of these unique reactions, selecting the agent to match the particular metal is essential for Class D fires. This isn’t the typical requirement for fires in other classes—ordinary combustibles, flammable liquids, and energized electrical fires rely on broader agent types (water, foam, CO2, dry chemical) rather than a metal-by-metal match.