The Main Reason That Surface Water Pollution Has Largely Decreased

Multiple Choice

The main reason that surface water pollution has largely decreased in the United States since 1950 is

A) the Clean Water Act.
B) a series of epidemics that inspired action.
C) the discovery of newer technology that makes it cheaper not to pollute.
D) decreases in water withdrawal for industrial uses.
E) the emphasis in 1950 of watershed management.