Answer: (Detailed Solution Below)
Option A: Only 1
Detailed Solution:
The correct answer is “Only 1 ”.
The Ram Ganga River is a tributary of the Ganges and it joins the Ganga near Kannauj in Uttar Pradesh.
The Betwa River is a tributary of the Yamuna, it joins the Yamuna near the town of Hamirpur in Uttar Pradesh, well to the north of Prayagraj.