The correct option is A Ganga
The Ganga is the largest river of India. The river has a length of 2525 km. It rises in Gangotri glacier near Gaumukh in the Uttarkashi district of Uttaranchal. Here, it is known as Bhagirathi. At Dev Prayaga, Bhagirathi meets the Alaknanda; hereafter it is known as the Ganga.