The correct answer is: b) The Palani Hills.
The Vaigai River is a river in the Indian state of Tamil Nadu. It originates in the Palani Hills and flows through the Madurai district before joining the Bay of Bengal. The river is a major source of irrigation and drinking water for the people of Madurai.
The Nilgiris are a mountain range in the Western Ghats of India. They are located in the states of Tamil Nadu, Karnataka, and Kerala. The Nilgiris are known for their beautiful scenery and their cool climate.
The Anamalai Hills are a mountain range in the Western Ghats of India. They are located in the states of Tamil Nadu and Kerala. The Anamalai Hills are known for their wildlife, including tigers, elephants, and leopards.
The Western Ghats are a mountain range in the Indian subcontinent. They are located along the western coast of India and extend from Gujarat in the north to Kerala in the south. The Western Ghats are a UNESCO World Heritage Site and are known for their biodiversity.