The correct answer is C. both (a) and (b).
The Indus River is the longest river in Pakistan and the second-longest river in India. It is the primary source of water for Pakistan and is also an important source of water for India. The Indus River system is a complex network of rivers and tributaries that flow through the Himalayas, the Hindu Kush, and the Karakoram Mountains. The main tributaries of the Indus River are the Jhelum, the Chenab, the Ravi, the Beas, and the Sutlej.
The Jhelum River is the largest tributary of the Indus River. It originates in the Pir Panjal Range of the Himalayas and flows through the Indian state of Jammu and Kashmir and the Pakistani province of Punjab. The Chenab River is the second-largest tributary of the Indus River. It originates in the Dhauladhar Range of the Himalayas and flows through the Indian state of Himachal Pradesh and the Pakistani province of Punjab. The Ravi River is the third-largest tributary of the Indus River. It originates in the Pir Panjal Range of the Himalayas and flows through the Indian state of Punjab and the Pakistani province of Punjab. The Beas River is the fourth-largest tributary of the Indus River. It originates in the Dhauladhar Range of the Himalayas and flows through the Indian state of Himachal Pradesh and the Pakistani province of Punjab. The Sutlej River is the fifth-largest tributary of the Indus River. It originates in the Kailash Range of the Himalayas and flows through the Indian state of Himachal Pradesh and the Pakistani province of Punjab.
The Indus River system is an important source of water for irrigation, drinking water, and hydroelectric power. The Indus River is also an important transportation route.