An Important Factor in the History of Water Pollution Control

An important factor in the history of water pollution control is that

A) the nonnational governments were without jurisdiction in controlling polluters within their boundaries.
B) the national government pre-empted state-local roles when society recognized the effects of polluted water on neighboring jurisdictions.
C) the nonnational governments were anxious for federal involvement.
D) such control was a traditional role for the national government from the earliest days of the nation.