The correct option is 3 i.e. Assam. ● The largest riverine island in the world 'Majuli' is located in Assam. ● Majuli is the largest freshwater island in the world. ● It is India's first Island district. ● The island is formed by the river Brahmaputra and its tributaries. ● The island is inhabited by tribes like Deori and Sonowal Kachari tribes. ● There are 5 National Parks in Assam they are: ◌ Kaziranga National Park ◌ Manas National Park ◌ Nameri National Park ◌ Dibru-Saikhowa National Park ◌ Orang National Park