A fire can be extinguished by removing __________.

Correct Answer: Option D — any of the above

Fire extinguishment relies on the fire tetrahedron: fuel, heat, oxygen, and the uninhibited chemical chain reaction. Removing any one of these elements—cooling the heat, starving the fuel, or displacing the oxygen—effectively breaks the combustion cycle, which is the fundamental principle taught in USCG-approved marine firefighting training programs.