Which of the Following Statements About Hydropower Is True

Which of the following statements about hydropower is true?

A) Dams have little or no impact on native aquatic organisms.
B) Hydropower includes dams, tides, and ocean currents.
C) Dams are relatively inexpensive to build but are expensive to operate.
D) The Wild and Scenic Rivers Act fosters the hydroelectric development of U.S. waterways.
E) Humans downstream of a dam may be exposed to waterborne diseases if the dam breaks.