Out of all the Biosphere Reserves in India, four have been recognized on the World Network by UNESCO. Which one of the following is not one of them?

The question refers to an older stage of the UNESCO World Network of Biosphere Reserves list. At the time this specific question was framed for the UPSC exam, only four reserves from India were recognized: Nilgiri, Gulf of Mannar, Sunderbans, and Nanda Devi. Therefore, Kanchenjunga was the correct answer as it was not part of the network then. However, for current knowledge, it is important to note that Kanchenjunga was added to the UNESCO World Network of Biosphere Reserves in 2018. As of today, 12 out of the 18 Biosphere Reserves in India are part of this international network. While B was the correct answer based on the historical context of the question, the status of these sites has since updated.