Explanation:

- Pulicat Lake: It's the second largest brackish water lake in India, located between Andhra Pradesh and Tamil Nadu. Known for its diverse birdlife, but not the largest protected wetland.

- Sundarbans: This is a vast mangrove forest area in the delta region of Padma, Meghna, and Brahmaputra river basins. It spans both India and Bangladesh. In India, it's the largest contiguous mangrove forest and a protected area but not the largest wetland.

- Upper Ganga River: This site extends from the Narora Barrage to the Ganges Barrage. It's important for its biodiversity but isn’t the largest protected wetland.

- Vembanad-Kol: Located in Kerala, i Known for supporting a rich variety of flora and fauna, it's a prominent Ramsar site.

- Correct Answer: Sundarbans is the largest protected wetland in India.