Correct Answer: Option D) All of the above
All four rivers mentioned - Ghagra, Gandak, Kosi, and Yamuna - are major Himalayan tributaries of the Ganga.
Ghagra (also known as Karnali): It originates in the Tibetan plateau near Lake Manasarovar and joins the Ganga near Chhapra in Bihar. It is the largest tributary of the Ganga by volume.
Gandak (also known as Narayani): It originates in Nepal Himalayas and joins the Ganga at Sonpur in Bihar. It forms a natural boundary between Uttar Pradesh and Bihar for a considerable distance.
Kosi (also called the "Sorrow of Bihar"): It originates in the Nepal Himalayas and is known for changing its course frequently, causing devastating floods. It joins the Ganga in Kursela, Bihar.
Yamuna: It originates from the Yamunotri Glacier in the Himalayas and is the largest tributary of the Ganga by length. It joins the Ganga at the Triveni Sangam in Prayagraj (Allahabad).