With reference to India, Didwana, Kuchaman, Sargol and Khatu are the names of ​

The correct answer is D (Saline lakes). Didwana, Kuchaman, Sargol and Khatu are all saline lakes in western Rajasthan, and they are the kind of inland water bodies that form in arid, closed basins where evaporation outpaces inflow, so salts concentrate over time. Didwana is the best-known of the group and is the basis for the familiar salt production of the region.

• A (Glaciers): Glaciers are masses of ice formed by compacted snow, found in the Himalayas and other high-altitude regions. Rajasthan's desert has no glaciers, so the names cannot belong here.
• B (Mangrove areas): Mangroves are coastal, tidal forests found in deltas and estuaries such as the Sundarbans. Inland Rajasthan has none.
• C (Ramsar sites): Ramsar sites are wetlands of international importance under the 1971 Ramsar Convention. Sambhar, the largest saline lake in India, is a Ramsar site (2002), but Didwana and the others are not on that list. This is the trap for many candidates.

The core concept is the formation and classification of inland wetlands in arid zones. It links to the Geography syllabus on physical features and to Mains GS-III on wetland conservation and the Wetlands Rules 2017.

Trap: Seeing Sambhar's Ramsar status and assuming every salt lake in Rajasthan is a Ramsar site. Check the name against the actual lake, not the region.