Correct Answer:
Option B - Indus is the longest river in Pakistan that originates from lake Mansarovar. In terms of annual water flow, it is the 21st largest river of the world. It is also known as Pakistan's lifeline, and is 3180 km long.
B. Indus is the longest river in Pakistan that originates from lake Mansarovar. In terms of annual water flow, it is the 21st largest river of the world. It is also known as Pakistan's lifeline, and is 3180 km long.