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The correct choice is indeed the type A fire extinguisher, which is specifically designed for fires that involve ordinary combustible materials such as wood, paper, cloth, and some types of plastics. Water-based fire extinguishers are effective because they work by cooling the burning materials, which is a critical function in extinguishing such fires. When water is applied to these materials, it reduces the temperature below the ignition point, thereby extinguishing the flames.

Type A extinguishers are typically labeled with a green triangle and are commonly found in residential and commercial settings where there is a risk of fires involving combustible solids. This makes them suitable for most environments where common materials are present, providing an essential safety measure against fire hazards.

In contrast, other types of fire extinguishers are designed for specific classes of fire: Type B is used for flammable liquids, Type C is suitable for electrical fires, and Type D is meant for combustible metals. Each of these extinguishers contains different agents that target their specific fire types and would not be effective against ordinary combustible materials that require cooling, such as those targeted by a Type A extinguisher.