Correct option is B
The sequence of Himalayan rivers that join the Ganga downstream of Prayagraj (formerly Allahabad) from west to east is as follows:
1. Gomati River:
Origin: The Gomati River originates from the Himalayas, specifically from the Gogra range in Uttarakhand.
Course: It flows southeastward through Uttar Pradesh and joins the Ganga near Ghazipur in Uttar Pradesh.
Confluence with Ganga: Although the Gomati joins the Ganga upstream of where the Ghaghara meets the Ganga, it is the westernmost of the mentioned rivers that joins the Ganga downstream of Prayagraj.
2. Ghaghara River:
Origin: The Ghaghara River originates in the Tibet Autonomous Region (TAR) of China, near the Tibetan Plateau.
Course: It flows through Nepal before entering India and is one of the major tributaries of the Ganga.
Confluence with Ganga: The Ghaghara joins the Ganga near the town of Chhapra in Bihar. This is the first of the major Himalayan rivers that join the Ganga downstream of Prayagraj as you move eastward.
3. Gandak River:
Origin: The Gandak River also originates in the Tibetan Plateau and flows through Nepal before entering India.
Course: It travels through the northern part of Bihar.
Confluence with Ganga: The Gandak joins the Ganga near the town of Hajipur, Bihar. It is located further east compared to the Ghaghara River.
4. Kosi River:
Origin: The Kosi River, known for its propensity to flood and cause devastation, originates in the Tibetan Plateau and flows through Nepal before entering India.
Course: It traverses several districts of Bihar.
Confluence with Ganga: The Kosi River joins the Ganga near the town of Kursela, Bihar. This is the easternmost of the major Himalayan rivers joining the Ganga downstream of Prayagraj.
