You are conducting training on fire fighting 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

Type A fires involve ordinary solid carbon-based combustibles requiring the primary cooling and quenching mechanisms provided by large volumes of water. Water penetrates deep-seated embers, reducing temperatures below the ignition point to extinguish the combustible material effectively.