Federal Standards Limiting the Amount of Arsenic Permitted in Drinking

Federal standards limiting the amount of arsenic permitted in drinking water were established as a result of

A) congressional legislation as a result of more than a year of hearings.
B) presidential executive order based on advice from the nation's best scientists.
C) a political battle between the Environmental Protection Agency and the National Rural Water Association.
D) a court order setting the limit.
E) state efforts to establish a comprehensive system governing water quality.