The use of one of the following is eco-friendly. This one is:(a) cars for transportation (b) polybags for shopping(c) windmills for generating power (d) dyes for colouring clothes

Correct Answer: (c) windmills for generating power

Explanation:

 Eco-friendly is a method that is environmentally friendly or that does not cause any harm to the environment.

Usage of cars involves the burning of fossil fuels that generate harmful gas as pollutants.

Polybags used for shopping are non-degradable plastics.

Dyes used for colouring clothes are made up of complex and toxic chemicals that non-biodegradable in nature.