Answer:
C) Dumping the materials in the open ocean
Step-by-step explanation:
United States have introduced the Ocean Dumping Ban Act in 1988, which made it illegal to handle solid waste as well as any industrial waste and sewage by dumping it into the open ocean.
The law became applicable starting from December 31, 1991. Meanwhile, there are several clauses that allow such actions, and provide possibility to pay penalties in certain cases.