Which fire classification involves flammable solids like wood or paper?

Class A fires are specifically associated with ordinary combustible materials, which include flammable solids such as wood, paper, cloth, and various plastics. These materials ignite easily and can sustain flames, making them a primary concern in fire safety. The characteristics of Class A fires involve the burning of these common materials, which typically produce ashes upon combustion.

In contrast, Class B fires involve flammable liquids and gases, while Class C fires pertain to electrical equipment. Class D fires involve combustible metals, which behave differently and require special extinguishing agents. Therefore, Class A is the correct classification for fires involving flammable solids like wood or paper, highlighting the need for specific fire response techniques and extinguishing agents tailored to address these types of materials effectively.