The correct answer is A) class A. A fire in a pile of rubber gasket material would be classified as a class A fire. Class A fires involve ordinary combustible materials such as wood, paper, cloth, rubber, and plastics. These materials tend to leave an ash or residue when burning. The fire in the rubber gasket material falls under this classification, as rubber is an ordinary combustible material. The other answer choices are incorrect because: B) class B fires involve flammable liquids and gases, C) class C fires involve energized electrical equipment, and D) class D fires involve combustible metals, none of which accurately describe the fire in the rubber gasket material.