Answer :
Final answer:
Vessels under 39.4 feet in Federally Controlled Waters must have a whistle or a horn as mandated by the U.S. Coast Guard for safety and signaling purposes.
Explanation:
In Federally Controlled Waters, vessels under 39.4 feet, including Personal Watercrafts, are required to have a whistle or a horn. Option A, which is a whistle or a bell, is the correct answer. These sound-producing devices are essential safety equipment for vessels to signal their intentions and position in times of reduced visibility and in meeting or crossing situations with other vessels to avoid collisions. The U.S. Coast Guard mandates the presence of a sound-producing device, such as a whistle or a horn, for these watercraft. Therefore, a whistle or horn serves as one of the primary pieces of safety gear required for smaller vessels operating in federally controlled waters.
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