The ancient practices of storing drinking water in subterranean tanks in Rajasthan's semi-arid regions is known as

Concept: Tankas is a traditional water storage technique.
Tankas is a traditional water storage technique.It is also known as tanka or kund.
This type of rain water harvesting method is common in the subterranean regions of
Rajasthan’s semi-arid region,E.X: Thar desert.
Hence,the correct answer is 3.