Class B fire may involve which of the following?

Class B fires are classified as fires that involve flammable liquids and gases. This includes substances such as paints, gasoline, liquefied petroleum gas (LPG), and other flammable or combustible liquids. These types of fires require specific extinguishing agents to effectively put them out, typically those that can smother the fire or remove it from the source of oxygen since water can often spread the fire with these materials.

The other substances mentioned in the other options do not fall under the Class B category. For instance, materials such as wood and cloth are associated with Class A fires, which involve ordinary combustibles. Motors, switches, and computers are connected to electrical fires typically classified as Class C. Lastly, combustible metals are categorized under Class D fires, requiring special handling due to the unique nature of the materials. Understanding these classifications is essential for proper fire safety measures and selecting the appropriate firefighting methods for each type of fire hazard.