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The correct answer is option 4, Nilgiris. A biosphere reserve is an area designated by UNESCO to promote the conservation of biological diversity while also allowing for sustainable development. In India, the first biosphere reserve was set up in the Nilgiris, which is a mountain range located in the southern state of Tamil Nadu. The Nilgiri Biosphere Reserve was established in 1986 and covers an area of about 5,520 square kilometers. It is known for its rich biodiversity, with numerous species of plants and animals found within its boundaries. The reserve is home to several endangered and endemic species, including the Nilgiri tahr and the Lion-tailed macaque. The establishment of the Nilgiri Biosphere Reserve has played a crucial role in conserving the unique ecosystems of the region and promoting sustainable development practices.