The correct option is B Kanchi River
The Dassam Falls is a waterfall located near Taimara village in Bundu police station of Ranchi district of Jharkhand. It is a natural cascade across the Kanchi River, a tributary of the Subarnarekha River. The water falls from a height of 44 metres. The sound of water echoes all around the place. The Dassam Falls is an example of a nick point caused by rejuvenation. Knick point, also called a nick point or simply nick, represents breaks in slopes in the longitudinal profile of a river caused by rejuvenation. The break in channel gradient allows water to fall vertically giving rise to a waterfall.