Which river in India flows in a rift-valley?

Q. Which river in India flows in a rift-valley?

A. Krishna
B. Cauvery
C. Narmada
D. Tapti

Answer: Narmada 

Narmada is the largest west flowing river of the peninsular India.
Narmada flows westwards through a rift valley between the Vindhyan Range on the north and the Satpura Range on the south.

Narmada River

The Narmada, also called the Rewa, is a river in central India and the sixth longest river in the Indian subcontinent. It is the third longest river that flows entirely within India, after the Godavari, and the Krishna. It is also known as "Life Line of Madhya Pradesh" for its huge contribution to the state of Madhya Pradesh in many ways. Narmada rises from Amarkantak Plateau near Anuppur district. It forms the traditional boundary between North India and South India and flows westwards over a length of 1,312 km (815.2 mi) before draining through the Gulf of Khambhat into the Arabian Sea, 30 km (18.6 mi) west of Bharuch city of Gujarat.

It is one of only three major rivers in peninsular India that run from east to west (longest west flowing river), along with the Tapti River and the Mahi River. It is one of the rivers in India that flows in a rift valley, flowing west between the Satpura and Vindhya ranges. The other rivers which flow through rift valley include Damodar River in Chota Nagpur Plateau and Tapti. The Tapti River and Mahi River also flow through rift valleys, but between different ranges. It flows through the states of Madhya Pradesh (1,077 km (669.2 mi)), and Maharashtra, (74 km (46.0 mi)),(39 km (24.2 mi)) (actually along the border between Madhya Pradesh and Maharashtra (39 km (24.2 mi)) and then the border between Maharastra and Gujarat (74 km (46.0 mi))) and in Gujarat (161 km (100.0 mi)).

The Periplus Maris Erythraei (c. 80 AD) calls it the Nammadus, and the British Raj called it the Nerbudda or Narbada. Narmada' is a Sanskrit word meaning "the Giver of Pleasure".