Question

The Wainganga & Penganga is the tributary of
a. The Mahanadi
b. The Narmada
c. The Godavari
d. The Krishna

Answer 1

Hint:
The river to which The Wainganga & Penganga is tributary of is the second-longest river in India after the Ganga River.
Its root is Trimbakeshwar, Maharashtra
It flows east for 1,465 kilometres, draining the states of Maharashtra, Telangana, Andhra Pradesh, Chhattisgarh, and Odisha.


Complete step by step solution:

Wainganga
Wainganga is a river in India that originates from the Mahadeo Hills in Mundara, near the village of Gopalganj in Seoni, Madhya Pradesh.
It's the main tributary of the Godavari.
The river flows south in a winding path through the states of Madhya Pradesh and Maharashtra, approximately 579 km (360 mi).
After joining the Wardha River, the unified current, known as the Pranahita River, flows into the Godavari River at Kaleshwaram, Telangana.

Penganga
The Painganga River (also known as the Penganga River) is the chief river of the district of Buldhana, district of Hingoli, district of Nanded, district of Yavatmal, district of Chandrapur, and district of Washim in the state of Maharashtra, India.
It flows along the southern border of the district in a twisting, meandering direction.
The overall length of the river is 495 kilometres (308 mi).
The Painganga River originates in the Ajantha range of the Aurangabad district of Maharashtra.


Hence, the correct answer is option C.

Note:
Its name, which means "Arrow of Water," was presumably taken from the names of the goddess Ganga and Venu, or Benu, the king who ruled Damoh in Puranic times.
Penganga, while it looks fine to be a tributary to the Godavari River, joins the Wainganga River from the north to form a conjoined stream or river called Pranhita.
Pranhita is the one who later joins the Godavari as a tributary.