The term ‘white coal’ is sometimes referred to which of the following?

C. Hydroelectricity

Hydroelectricity is sometimes referred to as “white coal” because it is a clean and renewable source of energy that can be used to generate electricity in a way that is similar to the way coal is used. Hydroelectric power plants use the energy of falling water to turn turbines that generate electricity, and they do not produce greenhouse gases or other pollutants, making them an environmentally friendly source of energy.