Mechanical foam used for firefighting is produced by __________.

Correct Answer: Option D — mechanically mixing and agitating foam chemical, water, and air

Mechanical foam is produced by an aspirating nozzle that mechanically mixes foam concentrate, water, and air. This agitation creates a stable, cohesive blanket of bubbles that smothers Class B fires by excluding oxygen and preventing the release of flammable vapors from the surface of the burning fuel.