The regulations that were passed to implement MARPOL 73/78 concerning oil pollution apply to a U.S. flag vessel that sails on which waters?

Correct Answer: Option B — International waters

MARPOL 73/78 is an international convention designed to minimize pollution of the seas. U.S. flag vessels are required to adhere to these regulations when operating in international waters, ensuring global consistency in environmental protection standards regarding oil, chemicals, and sewage discharge.