Explanation

Didwana, Kuchaman, Sargol, and Khatu are historic saline lakes (playas) situated in the arid inland drainage basins of Rajasthan:

– Didwana Lake: A renowned inland salt-water lake located in Nagaur district, famous for commercial sodium sulfate extraction and commercial salt harvesting.
– Kuchaman Lake: Another important saline depression in the Nagaur region.
– Sargol and Khatu: Localized shallow saline playas characterized by seasonal brine accumulation, where high evaporation rates leave mineral-rich evaporite crusts.

Therefore, these represent inland saline lakes — Option D.