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A class "B" fire involves

  1. Vegetable oils or fats

  2. Ordinary combustible materials

  3. Electrical equipment

  4. Flammable liquids

The correct answer is: Flammable liquids

A class "B" fire specifically involves flammable liquids, which include substances like gasoline, oil, alcohol, and other liquids that can ignite and produce a fire. These fires are characterized by the burning of materials that are dependent on fuel sources that are liquid at room temperature. In this classification system, each class of fire is defined by the types of materials that are burning, and in the case of class "B," the distinction is made for substances that can produce flammable vapors and lead to combustion. Understanding this helps in selecting the appropriate fire extinguishing methods, such as foam or dry chemical agents that are effective against flammable liquid fires.