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

1. The question asks to identify the common characteristic of Didwana, Kuchaman, Sargol, and Khatu in the context of India. 2. These places are all located in the state of Rajasthan. 3. Didwana, Kuchaman, Sargol, and Khatu are well-known for being saline lakes (salt lakes) or areas associated with salt production in the arid region of Rajasthan. 4. Option (A) is incorrect; glaciers are found in high mountainous regions, not Rajasthan. 5. Option (B) is incorrect; mangrove areas are coastal ecosystems. 6. Option (C) is incorrect; while some saline lakes can be Ramsar sites (like Sambhar Lake, also in Rajasthan), these specific names are primarily known as saline lakes, and not all are designated Ramsar sites. 7. Option (D) correctly identifies them as saline lakes.