The largest river of Pakistan is the

The Indus River is the longest and largest river of Pakistan flowing over 3000 kilometers from Tibet through Ladakh Gilgit Baltistan Khyber Pakhtunkhwa and Sindh before emptying into the Arabian Sea. It forms the backbone of the Indus Basin irrigation system which is one of the largest in the world. The river supports agriculture hydroelectricity and freshwater supply across the country. Other rivers such as Ravi Jhelum and Sutlej are tributaries that contribute to the Indus system. Therefore the largest river of Pakistan is the Indus which corresponds to option A.