The correct answer is option 'D', Rajasthan.

Rajasthan is the state in India that has the largest inland saline wetland, known as the Sambhar Salt Lake. Let's delve into the details of this wetland and understand why it holds such significance.

**Sambhar Salt Lake:**
The Sambhar Salt Lake is located in the Thar Desert region of Rajasthan. It is the largest inland saline wetland in India and serves as a crucial habitat for various species of birds, especially migratory birds. The wetland covers an area of approximately 190-230 square kilometers, depending on the season.

**Importance of Sambhar Salt Lake:**
1. Biodiversity Hotspot: Sambhar Salt Lake is designated as a Ramsar site, indicating its international importance as a wetland ecosystem. It is home to a rich and diverse range of flora and fauna, including several threatened and endangered species.

2. Migratory Birds: The lake attracts a large number of migratory birds during winter, including flamingos, pelicans, storks, and various species of ducks. It provides them with a suitable habitat and abundant food resources.

3. Salt Production: The Sambhar Salt Lake is a major source of salt production in India. The lake's water is highly saline, making it ideal for salt extraction. Salt production activities in the region have been carried out for centuries and contribute significantly to the local economy.

4. Tourism: The scenic beauty and ecological significance of the Sambhar Salt Lake make it a popular tourist destination. Visitors can witness the mesmerizing sight of thousands of migratory birds flocking to the lake and explore the unique ecosystem it supports.

**Conclusion:**
Rajasthan, with its vast expanse of the Sambhar Salt Lake, holds the distinction of having the largest inland saline wetland in India. The lake's ecological importance, salt production activities, and tourist appeal make it a significant natural asset for the state.