Water pollution in the United States has ______.

water pollution in the United States has ______.?

a. not been addresses by legislation the way air pollution has
b. increased in the last 30 years in places such as the Great Lakes
c. decreased in the last 30 years in places such as the Great Lakes
d. remained constant in the last 30 years in places such as the Great Lakes
e. only been addressed in the last 10 years, so changes will be seen over the next decade

c
(due to the EPA)
http://www.explainthatstuff.com/waterpol…
http://www.pollutionissues.com/Ve-Z/Wate…