The correct options are
A The region has some monuments of historical significance.
B Presence of wildlife sanctuaries.
The Ganga Brahmaputra has monuments which have a historical significance. This makes the Basin area a popular tourist destination. The Taj Mahal in Agra, Buddhist Stupas in Uttar Pradesh and Bihar, Imambara in Lucknow and the holy city of Varanasi are some of the important hotspots for tourists and visitors. The plain region of the basin consists of the Kaziranga and Manas wildlife sanctuaries which also attracts tourists.