The correct answer is (d). The Nilgiri hills are a mountain range in southern India that lie at the junction of the states of Karnataka, Kerala, and Tamil Nadu. The Nilgiri hills are a popular tourist destination, known for their beautiful scenery, tea plantations, and wildlife.
The Anaimalai hills are a mountain range in southern India that lie in the state of Tamil Nadu. The Anaimalai hills are home to the Anamalai Tiger Reserve, one of the largest tiger reserves in India.
The Palni hills are a mountain range in southern India that lie in the states of Tamil Nadu and Kerala. The Palni hills are home to the Eravikulam National Park, one of the most important elephant reserves in India.
The Nandi hills are a mountain range in southern India that lie in the state of Karnataka. The Nandi hills are a popular pilgrimage destination, known for the Nandi Temple, which is dedicated to the Hindu god Nandi.