Answer:
The correct answer would be water.
The coal-fired power plants are those which use the combustion of coals to produce electricity.
The combustion of coal in the furnace provides enough energy to convert water into the steam.
The steam is channelized towards the turbine.
The steam then rotates the turbines of the electric generator which produces electricity.
The transformer then converts the electricity produced into the high voltage which supplied to the people.
