What type of fires can be tackled with water and foam?

Water and foam can be effective in combating Class A and Class B fires, making this answer applicable depending on particular circumstances. Class A fires involve ordinary combustible materials such as wood, paper, and textiles, which can be extinguished by water due to its cooling effect. Foam is particularly valuable in Class B fires, where flammable liquids like gasoline and oil are present. The foam acts to smother the flames, depriving the fire of oxygen and cooling the burning liquid.

While Class C fires involve energized electrical equipment and typically require non-conductive extinguishing agents, and Class D fires relate to combustible metals that react with water, they do not suit water and foam as effective agents. Additionally, Class K fires pertain to cooking oils and fats, which require specific extinguishing agents developed for those materials. Given this context, the use of water and foam is indeed vital for addressing both Class A and Class B fires, clarifying the reasoning behind the correct response.