The Barak Valley region in Assam is known for its:

Tea plantations
Distinct culture and language
Hilly terrain
Wildlife sanctuaries

The correct answer is: a) Tea plantations.

The Barak Valley region in Assam is known for its tea plantations. The region is home to some of the largest tea plantations in the world, and the tea produced there is known for its high quality. The tea plantations are a major source of employment in the region, and they also contribute to the local economy.

The other options are incorrect for the following reasons:

  • Option b is incorrect because the Barak Valley region is not known for its distinct culture and language. The region is home to a diverse population of people from different ethnic groups, and there is no single culture or language that is dominant.
  • Option c is incorrect because the Barak Valley region is not known for its hilly terrain. The region is located in the Brahmaputra Valley, which is a lowland region.
  • Option d is incorrect because the Barak Valley region is not known for its wildlife sanctuaries. There are a few wildlife sanctuaries in the region, but they are not as well-known as the wildlife sanctuaries in other parts of Assam.