The answer is it prohibits ocean dumping by the US.
This option is incorrect. The Marine Protection, Research, and Sanctuaries Act of 1972 (MPRSA) does not primarily focus on regulating offshore drilling. Instead, offshore drilling is more directly regulated by other laws such as the Outer Continental Shelf Lands Act (OCSLA) and the Oil Pollution Act (OPA).
This option is also incorrect. While the MPRSA may indirectly impact ocean fishing and tourism by protecting marine environments, its primary purpose is not to allow or regulate these activities. Other laws and regulations, such as the Magnuson-Stevens Fishery Conservation and Management Act, are more directly concerned with ocean fishing.
This option is correct. The MPRSA, also known as the Ocean Dumping Act, was enacted to prohibit the dumping of material into the ocean that would unreasonably degrade or endanger human health, welfare, or amenities, or the marine environment, ecological systems, or economic potentialities. The act establishes a permit program to regulate the disposal of materials into U.S. ocean waters and promotes research on ocean dumping and its effects.