Which of the following denotes a Class A fire?

Class A fires are characterized by the presence of ordinary combustibles, which typically include materials such as wood, paper, cloth, rubber, and some plastics. These materials ignite and burn readily, making them the primary concern in most residential and industrial settings. The proper extinguishing agent for Class A fires is usually water, which cools the burning material below its ignition temperature.

In contrast, flammable liquids typically classify as Class B fires, where the concern lies with substances like gasoline, oil, and solvents that produce vapors that can easily ignite. Electrical fires are categorized as Class C, involving energized electrical equipment, where water might pose a risk of electrical shock. Lastly, metals such as magnesium and sodium, which burn at extremely high temperatures, fall under Class D fires. Each classification helps responders choose the correct strategy and extinguishing agent to employ, emphasizing the importance of understanding these categories in fire safety and response.