Answer:
Option (3)
Step-by-step explanation:
Windmills are usually considered to be a structure that is commonly used in the region where there is a high amount of wind supply and converts the wind energy into electrical energy.
Wind is a renewable resource as it can be regenerated, and it does not emit any kind of harmful gases that can pollute the environment.
As these windmills produce electricity, it is being used by the farmers in the given region, and the excess amount of energy is sold to the various power companies by the individuals. This electrical energy so produced directly replaces the fossil fuels, that emits a significant amount of carbon and affects the environment.
Thus, the correct answer is option (3).