The correct answer is: d) Jaintia Hills.
Sillimanite is a valuable mineral used in refractories, and is found in the Jaintia Hills of Meghalaya. It is a hard, brittle mineral that is typically white or gray in color. It is used in a variety of applications, including the manufacture of ceramics, glass, and other products.
The Jaintia Hills are a mountain range in the state of Meghalaya in northeastern India. The hills are named after the Jaintia people, who are the indigenous inhabitants of the region. The Jaintia Hills are a popular tourist destination, and are known for their beautiful scenery, including waterfalls, forests, and lakes.
The Jaintia Hills are also home to a number of important historical and cultural sites, including the ruins of the Jaintia kingdom. The Jaintia kingdom was a powerful kingdom that existed in the region from the 13th to the 19th centuries. The kingdom was known for its wealth and its sophisticated culture.
The Jaintia Hills are a beautiful and culturally rich region of India. The hills are home to a number of important historical and cultural sites, and are a popular tourist destination. The Jaintia Hills are also home to a number of valuable minerals, including sillimanite.