The correct answer is option 4, Wular.
To better understand the options, let`s look at each one:
1. Chilika: Chilika is a brackish water lake, meaning it is a mix of saltwater and freshwater. It is located in Odisha, on the east coast of India.
2. Loktak: Loktak is a freshwater lake located in Manipur, in northeastern India. It is the largest freshwater lake in northeastern India, but it is not the largest in the entire country.
3. Dal: Dal Lake is a freshwater lake located in Srinagar, in the Indian state of Jammu and Kashmir. It is famous for its scenic beauty and houseboats, but it is not the largest freshwater lake in India.
4. Wular: Wular Lake, located in Jammu and Kashmir, is the largest freshwater lake in India. It is located in the Kashmir Valley and is surrounded by mountains. The lake serves as an important source of fish and is also a popular tourist destination.
Therefore, the correct answer is option 4, Wular. It is the largest freshwater lake in India.