A pressurized water extinguisher is designed for which class of fires?

A pressurized water extinguisher is specifically designed for Class A fires, which involve ordinary combustible materials such as wood, paper, cloth, rubber, and certain plastics. The effectiveness of water extinguishers lies in their ability to cool the burning material and remove heat, which is essential for extinguishing these types of fires. Water does not effectively address fires involving flammable liquids, gases, or electrical equipment, which are categorized under other classes of fires. Therefore, the design and purpose of a pressurized water extinguisher align directly with the characteristics of Class A fires, making it the appropriate choice for this question.