AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(C) Tankas
The passage clearly states that in semi-arid and arid regions of Rajasthan (Bikaner, Phalodi, Barmer), houses traditionally had underground tanks called tankas for storing drinking water. Kuls/Guls are diversion channels in Western Himalayas; Khadins and Johads are rainwater storage structures for agriculture in Rajasthan, not drinking water tanks.