Which of the Following Factors Has Hindered the Successful Implementation

Which of the following factors has hindered the successful implementation of the Clean Water Act?

A) It remains unclear if the state or the federal government is primarily responsible for the implementation of the act.
B) Its jurisdiction is limited to monitoring the discharge of pollutants into navigable waters.
C) It is implemented by the states under the supervision of the Environmental Protection Agency.
D) It remains unclear exactly what waters are actually covered by the act.