Which description gives the steps for creating hydroelectric power?

a. River water stored in a reservoir flows down a channel in a dam, turning a turbine as it passes. The turbine is connected to a generator that produces electricity, and then the water continues downstream.

b. River water stored in a reservoir flows through a turbine and into a channel in a dam. At the end of the channel, the water turns a generator, which produces electricity; then the water flows back upstream.

c. River water enters a dam through a generator. The movement of the water through the generator produces electricity. Then the water flows out of the dam through turbines into a reservoir.

d. River water enters a dam through channels. The channels are connected to a transformer, which turns a generator, producing electricity. The water is then transported through turbines to wastewater canals.