The correct answer is A) class A. A fire in a pile of rubber gasket material would be classified as a class A fire because class A fires involve ordinary combustible materials such as wood, paper, cloth, rubber, and plastics. Rubber gasket material falls under the category of ordinary combustible materials, so a fire involving this type of material would be considered a class A fire. The other answer choices are incorrect because class B fires involve flammable liquids and gases, class C fires involve energized electrical equipment, and class D fires involve combustible metals, which do not apply to a fire in a pile of rubber gasket material.