The correct option is B Assam
The Ganga-Brahmaputra plains are rich in wildlife. The One-horned rhinoceros are found in Assam. The Bengal tiger is found in the Sunderban delta. The Sunderban delta also consists of crocodiles and other animals. In fresh river waters and lakes of the Ganga-Brahmaputra region, a variety of fishes like rohu, katla and hilsa are found.