The correct answer is: b) Khasi and Jaintia Hills.
The Khasi and Jaintia Hills are a mountain range in northeastern India. They form a natural boundary between the Indian states of Meghalaya and Assam. The hills are home to a number of indigenous tribes, including the Khasis, Jaintias, and Garos. The hills are also home to a number of important rivers, including the Brahmaputra, the Meghna, and the Barak.
The Khasi and Jaintia Hills are a popular tourist destination. The hills are known for their beautiful scenery, their unique culture, and their friendly people.
The other options are incorrect because:
- The Patkai Hills are a mountain range in northeastern India. They form a natural boundary between India and Myanmar.
- The Naga Hills are a mountain range in northeastern India. They form a natural boundary between India and Myanmar.
- The Aravalli Hills are a mountain range in northwestern India. They form a natural boundary between the Indian states of Rajasthan and Gujarat.