The correct answer is option 3, Nilgiris. The Lion-tailed Macaque is a primate species that is native to the Western Ghats mountain range in South India. Specifically, it is found in the Nilgiri Biosphere Reserve, which spans across the states of Tamil Nadu, Kerala, and Karnataka. This reserve is known for its rich biodiversity, and the dense evergreen forests of the Nilgiris provide an ideal habitat for the Lion-tailed Macaque.

Option 1, Maikala hills, is not the natural habitat of Lion-tailed Macaque. Maikala hills are located in the Maikal Range of the Satpura mountain range in central India, which is not the native habitat of this species.

Option 2, Neora valley, is also incorrect. Neora Valley National Park is located in the Darjeeling district of West Bengal in Eastern India, which is far away from the natural habitat of the Lion-tailed Macaque.

Option 4, Pachmarhi, is also not the natural habitat of Lion-tailed Macaque. Pachmarhi is a hill station located in the Indian state of Madhya Pradesh, which is not part of the Western Ghats where this species is found.

Therefore, option