The correct options are
A Ganga and Brahmaputra river system
B Backwaters of Kerala
C Godavari river
D Krishna river
Inland waterways exist in the form of rivers, canals and lakes. Here, transportation occurs inside a mass of land.
Some of the important inland waterways in India are the Ganga and Brahmaputra river system, the backwaters of Kerala and Godavari and Krishna rivers.