Khadins, Bundhis, Ahars and Kattas are ancient structures that are examples for
The correct option is C Water harvesting The given terms denote ancient structures dedicated for water harvesting. Water harvesting is a term which means storage of water during rains. Traditionally, small dams and other reservoirs were built so that rainwater could be stored for later use. For example, Khadins and nadis in Rajasthan, bundhis in Madhya Pradesh and Uttar Pradesh, ahars and pynes in Bihar, and kattas in Karnataka are some of the ancient water harvestings, including water conveyance, structures. These are still in use at many places. These structures were not having any adverse effect on local natural balance and had no environmental costs.