Correct Answer: (b) Shyok-Zaskar-Spiti-Satluj
Note: Shyok river is known as 'River of Death' in the Karakoram. ancient evidences indicate that it was also a medium of trade between Yarkand and Ladakh.
Zanskar (Zaskar) river flows through hard rock and form the deep gorge. It originates on the border of Himachal Pradesh and Ladakh. It flows in north-east and joints Indus at Nimu. Spiti river originates from Kunzum pass. It merges into Sutlej river near Namgia in Kinnaur district of Himachal Pradesh after flowing 60 miles.
Sutlej (Satluj) river rises in Tibet it crosses Great Himalaya and Zaskar (Zanskar) range and crosses Indo-Tibet border near Shipki La. Spiti river merges in Sutlej (Satluj) from the north. Thus the correct order of the above rivers from north to south is- Shyok - Zanskar (Zaskar) – Spiti - Sutlej (Satluj).