The correct answer is D) The owner or Master of the vessel. The small passenger vessel regulations require the owner or Master of the vessel to prepare and post Emergency Instructions in a conspicuous place accessible to the crew and passengers. This is because the owner or Master has the ultimate responsibility for the safety and emergency preparedness of the vessel and its occupants. The other options are incorrect because the U.S. Coast Guard sets the regulations but does not directly prepare the emergency instructions for each vessel, the classification society is responsible for vessel design and certification, and the builder is responsible for constructing the vessel according to the regulations, but not for the ongoing emergency planning and instructions.