Answer:
C. Agricultural runoff
Step-by-step explanation:
Clean Water Act is a U.S. federal law that controls the discharge of waste substances that is coming from houses and industries in the form of garbage, sewage and harmful chemicals into the country's surface waters, including lakes, rivers, streams, wetlands, and coastal areas. This act was passed in 1972 in the united states of America. This act helps in maintaining and saving of the life of marine animals which is an important part of our environment. Agricultural runoff is excluded in the Clean water Act. Agricultural runoff is a water that comes from the field through irrigation and rainfall etc.