The correct options are
A Ganga and Brahmaputra river basin
B Deltaic areas of river basins in Peninsular India
D Lower parts of Narmada and Tapi river basins
Flood prone areas are regions where floods occurs repeatedly. Some of them are:
1. Ganga and Brahmaputra river
2. Deltaic areas of river basins in Peninsular India
3. The Sutluj, the Beas, the Ravi and Chenab river basins
4. Lower parts of Narmada and Tapi river basins.