Class B fires are primarily fueled by which type of substances?

Class B fires are primarily fueled by liquids and volatile substances, which is why this choice is the correct answer. These types of materials include flammable liquids like gasoline, oil, paints, and solvents, which can produce vapor and ignite easily. Understanding the classification of fires is crucial for effective fire prevention and response.

Class B fires are distinguished from other classifications, such as Class A fires that involve ordinary combustible materials like wood and paper, or Class C fires that involve energized electrical equipment. Each type of fire requires a specific approach for extinguishment, significantly impacting safety measures and firefighting tactics. For instance, using water on a Class B fire can be dangerous, as it may spread the flammable liquid, whereas specialized extinguishing agents like foam, dry chemical, or CO2 are effective against Class B fires. This knowledge is vital for anyone working in environments where such hazards exist and reinforces the importance of proper training in fire safety protocols.