The correct answer is B) Class B. A galley grease fire would be classified as a Class B fire. Class B fires involve flammable liquids, gases, and greases. Grease fires in the galley of a vessel fall under this category, as they are typically fueled by cooking oils and other flammable substances common in a ship's kitchen. The other answer choices are incorrect because Class A fires involve ordinary combustible materials, Class C fires involve energized electrical equipment, and Class D fires involve combustible metals, none of which accurately describe a galley grease fire.