The correct answer is A. Majuli Island.
Majuli is the largest river island in the world, located in the Brahmaputra River in Assam, India. It is home to over 150,000 people and is a UNESCO World Heritage Site. The island is known for its unique culture and traditions, as well as its natural beauty.
Barak is a river in the Indian states of Assam and Meghalaya. It is the largest tributary of the Brahmaputra River. The Barak River is about 500 kilometers long and has a drainage basin of about 20,000 square kilometers.
Barail is a mountain range in the Indian states of Assam and Meghalaya. It is part of the Eastern Himalayas. The Barail Range is about 500 kilometers long and has a maximum elevation of about 2,400 meters.
None of these is the correct answer.