Harnessing the Energy of Tides to Generate Electricity Is Different

Harnessing the energy of tides to generate electricity is different than the force moving the water in a hydroelectric power station at a dam because

A) tidal energy uses turbines and a dam uses generators.
B) tidal energy ultimately relies on moon's gravity and hydroelectric power ultimately relies on the energy from the sun.
C) tidal energy ultimately relies on ocean currents and hydroelectric power ultimately relies on the energy from the sun.
D) tidal energy ultimately relies on the wind and hydroelectric power ultimately relies on the energy of rain.