Correct Answer: (a) Pranhita-Mahanadi
Solution:The Pranhita River is tributary of Godavari River not of Mahanadi River. The Godavari River is the largest river in peninsular India and known as the 'Dakshina Ganga'. The Godavari Basin is the second largest basin after the Ganges basin and accounts for nearly 9.50% of the total geographical area of the country. The River rises in the Sahyadris, at an altitude of 1,067 m above mean sea level near Trimbakeshwar in the Nashik district of Maharashtra and flows across the Deccan Plateau from the Western to the Eastern Ghats The principal tributaries of the river Godavari are Pravara, Purna, Manjra, Penganga, Wardha, Wainganga, Pranhita (combined flow of Wainganga, Penganga, Wardha), the Indravati, the Maner and the Sabri.