Which of the following items would cause a Class B fire?

Gasoline is classified as a flammable liquid, making it a key factor in Class B fires, which involve combustibles like petroleum products and flammable liquids. When gasoline ignites, it can lead to rapid and intense fire spread, requiring specific fire suppression methods, such as the use of foam or dry chemical extinguishers designed for flammable liquids.

Plywood and cotton, found in options A and C, are classified as Class A materials. Class A fires primarily involve ordinary combustibles, such as wood, paper, and fabric, which burn differently compared to liquid fuels like gasoline. Natural gas, while also flammable, falls under different categories and is associated with gaseous fires rather than liquid fires, making it less relevant in the context of Class B fires. Understanding these classifications is crucial for effective fire prevention and response strategies.