Majuli Festival showcases the cultural heritage of the river island, Majuli, known for its:

The correct answer is: a) Vaishnavite monasteries (Sattras).

Majuli is the largest river island in the world, located in the Brahmaputra River in Assam, India. It is home to a unique culture and heritage, and is known for its Vaishnavite monasteries (Sattras). The Majuli Festival is an annual event that celebrates the island’s culture and heritage. It features a variety of events, including traditional music and dance performances, boat races, and cultural exhibitions.

The other options are incorrect because:

• Tea plantations are not a major feature of Majuli.
• Majuli does not have a wildlife sanctuary.
• Majuli does have ancient temples, but they are not the main focus of the Majuli Festival.