The correct answer is (a) Anaimudi. Anaimudi is the highest peak in South India, located in the Western Ghats mountain range in the state of Kerala. It has an elevation of 2,695 meters (8,842 feet). Dodabetta is the second highest peak in South India, located in the Nilgiri Hills mountain range in the state of Tamil Nadu. It has an elevation of 2,637 meters (8,651 feet). Amarkantak is a hill station located in the state of Madhya Pradesh. It is not the highest peak in South India. Mahendragiri is a mountain located in the Eastern Ghats mountain range in the state of Andhra Pradesh. It is not the highest peak in South India.
Anaimudi is a popular tourist destination, and there are several trekking routes to the summit. The best time to visit Anaimudi is during the winter months (November to March), when the weather is cool and dry.