The federal law aimed at ensuring that all rivers are swimmable and fishable and that limits the discharge of pollutants in u. s. waters to zero is the:

The Federal Water Pollution Control Act of 1948 was amended in 1972 and was known as the Clean Water Act (CWA) which sets the water quality standards for all contaminants in surface waters and implemented wastewater standards for industry.

The way this small state - large state compromise guards against tyranny is that small states and large states have one note: i am sorry but i was not able to give you the full answer. but i got this answer from

Im going to say its either a or d but im leaning more to d