You are conducting training on firefighting procedures. What type of fire is characterized by the burning of ordinary combustible materials where the quenching and cooling effects of quantities of water, or solutions containing large percentages of water, are of first importance?

Correct Answer: Option A — Type A

Class A fires involve ordinary combustible materials such as wood, paper, cloth, and rubber. The most effective method for suppression is cooling the fuel below its ignition temperature. Water is the primary agent for these fires due to its high latent heat of vaporization, which provides superior cooling capacity.