The correct answer is D) U.S. government. The Oil Record Book for all fixed or floating drilling rigs is the property of the U.S. government. This is because the Oil Record Book is a regulatory requirement under U.S. law, specifically the Act to Prevent Pollution from Ships (APPS), which implements the International Convention for the Prevention of Pollution from Ships (MARPOL) in the United States. The Oil Record Book must be maintained and made available for inspection by the U.S. Coast Guard, regardless of the drilling rig's owner, lessee, or location. The other options are incorrect because the Oil Record Book is not the property of the drilling rig's owner (A), the company leasing the drilling rig (B), or the state in whose waters the drilling rig is located (C). It is a federally mandated document that belongs to the U.S. government.