A
glaciers
B
mangrove areas
C
Ramsar sites
D
saline lakes
Correct answer: (d) saline lakes
Explanation
- A
glaciers
Glaciers. These are Rajasthan names, not Himalayan ice.
- B
mangrove areas
Mangroves. Inland Thar, not coast.
- C
Ramsar sites
Ramsar sites. Not this list as a class.
- D
saline lakes
Saline lakes. Didwana, Kuchaman, Sargol, Khatu — playas of Rajasthan.
Summary. Official key is (d) saline lakes. Didwana, Kuchaman, Sargol and Khatu are salt lakes / playas of the Rajasthan desert, not glaciers, mangroves or a Ramsar set.