Answer:
B. Geothermal
C. hydroelectric
Explanation:
Nordic countries are smaller countries which are wealthy. These nations are pioneers in electricity markets in the whole world.
Electricity is produced from low-carbon sources of electricity, mostly from renewable sources of energy; thereby becoming energy-efficient nations.
Geothermal energy forms the core of energy produced in Nordic nations. The heat in the core of Earth and hot springs is transformed in electricity.
Hydroelectric sources forms the backbone of energy production in Nordic nations. The motion or kinetic energy of water is converted into electricity.
Geothermal and hydroelectric sources of energy form the cleanest renewable sources of energy.
