What type of extinguishing method is effective for Class A fires?

Using the heat-absorbing effects of water is an effective method for extinguishing Class A fires, which involve ordinary combustible materials such as wood, paper, and textiles. Water works by absorbing heat from the burning material, thereby lowering the temperature below the ignition point and effectively extinguishing the fire. This method is well-established and widely used due to water's availability and its ability to cool the fire rapidly.

Other options might serve different functions but are not as effective for Class A fires specifically. For instance, a blanket may smother a fire by cutting off oxygen, but it is not a practical solution for all scenarios or larger Class A fires. Foam application, while useful for Class B fires (flammable liquids), does not target the heat-absorbing aspect that water provides for Class A. Direct chemical reactions can extinguish fires as well, but they typically involve agents suited for specific fire classes rather than the simplicity and effectiveness of water for ordinary combustibles.