The correct option is B Potential - Kinetic - Electrical
The potential energy of water which is stored in dams gets converted into kinetic energy when the gates of the dams are opened. This heavy water flow strikes the blades of the turbine and causes it to spin. This shaft which connects the turbine to a generator produces electrical energy.
So, the energy conversion in hydropower plants can be summarised as:-
Potential energy - Kinetic energy - Electrical energy