Which of the following is against the law in Florida?

Wearing an inflatable personal flotation device (PFD) while operating a personal watercraft in Florida is against the law because specific regulations dictate the types of PFDs that are acceptable for certain activities. In Florida, inflatable PFDs are not permitted to be worn while operating jet skis or similar personal watercraft. This regulation is grounded in safety concerns, as inflatable PFDs may not provide immediate buoyancy or adequate protection in emergency situations typical for personal watercraft use.

In this context, it is important to understand that the other choices involve regulations that may have different implications. For example, operating a boat without proper registration, failing to provide safety equipment, and exceeding the maximum speed limit are circumstances that also carry penalties, but they do not specifically pertain to the operation of a personal watercraft or the use of PFDs in the same manner. These regulations are there to ensure safety on the water, but they do not directly oppose existing laws as is the case with inflatable PFD usage on personal watercraft in Florida.