In the united states, the electricity generated by hydropower is about
a. twice that generated by solar and geothermal.
b. equal to that generated using wind technologies.
c. twice as much as that generated by wind, solar, and geothermal.
d. equal to that generated using solar technologies.

It's about equal to that generated using wind technologies

Hydropower is usually an energy generator that used the force of water to generate power

Usually , it created by placing giant magnet wheel underneath a waterfall. The force of the waterfall will spin the magnetic wheel and the rotation of the magnet will create an electricity power