Which river is also known as Dakshin Ganga?

Correct option is A

River Godavari is also known as Dakshin Ganga. So the answer is (a).
 It is also known as Vridh Ganga. It is the largest Peninsular river system. It rises in the Nasik district of Maharashtra and discharges its water into the Bay of Bengal.
 Its tributaries run through the states of Maharashtra, Madhya Pradesh, Chhattisgarh, Odisha and Andhra Pradesh.
 Pravara, Purna, Manjra, Penganga, Wardha, Wainganga, Pranhita (combined flow of Wainganga, Penganga, Wardha), Indravati, Maner and the Sabri are tributaries of Godavari.