The correct answer is A) Heat Detector. The vessel fire control plan in illustration D036SA indicates that a heat detector is located in the scullery. This is in accordance with Coast Guard regulations, which require heat detectors and other fire detection equipment to be installed in areas of the vessel that are prone to fire hazards, such as the scullery where cooking and other heat-generating activities take place. The other answer choices are incorrect because they do not represent the fire safety equipment shown in the scullery on the fire control plan. The Gaylord system release valve, fixed water extinguishing system, and fire alarm pull box are likely located in other areas of the vessel, but not specifically in the scullery as indicated in the given illustration.