The correct answer is: a) The Nilgiris.
The Nilgiris, also known as the Blue Mountains, are a mountain range in the Western Ghats of India. They are located in the states of Tamil Nadu, Kerala, and Karnataka. The Nilgiris are home to the Nilgiri tahr, a mountain goat that is found nowhere else in the world. The Nilgiris are also home to a number of other endangered species, including the Nilgiri langur and the Nilgiri marten.
The Nilgiris are a popular tourist destination, known for their beautiful scenery, cool climate, and tea plantations. The Nilgiris are also home to a number of hill stations, including Ooty, Coonoor, and Kotagiri.
The Nilgiris are a UNESCO World Heritage Site.
The other options are incorrect because:
- The Palani Hills are located in the state of Tamil Nadu.
- The Anamalai Hills are located in the state of Tamil Nadu.
- The Kolli Hills are located in the state of Andhra Pradesh.