Correct option is A
The correct answer is (a) Nilgiri.
· The Nilgiri Hills are where the Western Ghats and Eastern Ghats meet. This hill range is located in the southern part of India, primarily in the state of Tamil Nadu, and is known for its rich biodiversity and scenic beauty.

Information Booster:
· Amarkantak : A hill range in Madhya Pradesh, known as the origin of the Narmada and Son rivers.
· Shivalik : The outermost range of the Himalayas, running parallel to the main Himalayas.
· Maikal : A hill range in central India, part of the Satpura range.