Which factor best describes how the fire class relates to extinguisher use?

• A. Color of the extinguisher.
• B. Fire class.
• C. Brand of the extinguisher.
• D. Model year.

Answer: (B)

The main idea here is that extinguishers are matched to specific fire classes. The fire class tells you what is burning, and that determines which extinguishing agent will work safely and effectively. Because different fuels require different approaches to stop burning, you pick an extinguisher that is rated for that class. For instance, fires involving ordinary combustibles like wood or paper respond to water-based or foam extinguishers, while flammable liquids need different agents, and electrical fires require nonconductive options and usually a no-water approach. Fires involving metals need specialized powders, and kitchen fires have their own wet chemical extinguishers. This direct link—fire class guiding the appropriate extinguisher—makes the fire class the key factor. Other attributes such as color, brand, or model year don’t determine what you can safely use on a given fire.