The correct answer is A) class A. A fire involving trash and paper waste would be classified as a class A fire, as per the fire classification system used in the US Coast Guard Captain's License Examinations. Class A fires involve ordinary combustible materials, such as wood, paper, cloth, rubber, and plastics. Since trash and paper waste fall under this category of ordinary combustible materials, a fire involving them would be considered a class A fire. The other options 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, none of which are applicable to a fire involving trash and paper waste.