What are the four types of fires classified by the National Fire Protection Association (NFPA)?

The National Fire Protection Association (NFPA) classifies fires into four categories based on the materials that fuel them. These classifications are Class A, Class B, Class C, and Class D. Class A fires involve ordinary combustible materials such as wood, paper, and textiles. Class B fires are fueled by flammable liquids, gases, or greases, while Class C fires involve energized electrical equipment. Class D fires occur with combustible metals, like magnesium or titanium.

This classification system is essential because it helps in identifying the appropriate firefighting methods and extinguishing agents needed for each fire type. For example, using water on a Class B fire can be dangerous, as it can spread the flammable liquids. Understanding fire classifications is crucial for safety training, as different types of fires require different response strategies and equipment.

The other options include classifications that do not align with the NFPA's established standards. Class E and other numerically labeled classes are not recognized fire classifications by the NFPA, making option A the only correct choice.