Explanation:

Only statements 1&2 are correct.

• Bura Chapori Wildlife Sanctuary is geographically located on the south bank of the Brahmaputra but under the Sonitpur district in Assam.

• It is a part of the Laokhowa-Burachapori eco-system and comprises of a mosaic of wet alluvial grassland, riparian and semi-evergreen forests dotted by wetland and river systems. 

• Fauna: This sanctuary is home to the Great Indian one-horned rhinoceros, tiger, leopard, wild buffalo, hog deer, wild pig, and elephants.

• The bird list includes the Bengal Florican (highly endangered), Black-necked Stork, Mallard, Open billed Stork, Teal, and Whistling Duck among others.

Hence option 1st is correct.