What is the 4R principle?

The correct option is A

Reduce, Reuse, Recycle and Recover

The 4R principle is: Reduce, Reuse, Recycle and Recover.
Reduce: This refers to the reduction or decreased consumptions of material made up of plastic.
Reuse: This refers to use of discarded plastic bottles and jars to store food items and water.
Recycle: This refers to give the old plastic chairs and jars, etc., for a recycle and using the recycled items.
Recover: This refers to use plastic to create energy, in the form of heat and power using incineration, anaerobic digestion or other techniques.