Answer:
The correct answer is the energy of the Sun striking photovoltaic cells producing a flow of electrons.
Step-by-step explanation:
The radiation from the Sun coming in contact with the photovoltaic cells generating a flow of electrons describes the forces, which produce solar power.
The heat energy underneath the surface of the Earth, which heats underground water into steam is an illustration of geothermal energy.
Heat energy discharged at the time of nuclear fission and the generation of steam taking place to start a turbine is an illustration of nuclear power.
The heat from the core of the Earth and pressure transforming the remnants of dead animals and plants is an illustration of generation of fossil fuels.