The correct option is The Ravi.
Explanation
The drainage system of Himachal Pradesh is primarily constituted by major tributaries of the Indus River system, including the Chenab, Ravi, Beas, and Satluj. Each of these rivers flows through and shapes distinct valleys within the state.
- The Beas: Incorrect. The Beas originates near the Rohtang Pass on the southern end of the Pir Panjal Range. It flows through the Kullu Valley and forms a deep gorge at Kati and Largi.
- The Ravi: Correct. The Ravi rises west of the Rohtang Pass in the Kullu hills. It flows through the Chamba Valley of Himachal Pradesh, draining the area between the Pir Panjal and the Dhauladhar ranges.
- The Satluj: Incorrect. The Satluj originates from the Rakas Lake near Mansarovar in Tibet. It enters India at Shipki La and flows through the Kinnaur district, cutting deep gorges across the Great Himalaya and Zaskar ranges.
- The Chenab: Incorrect. The Chenab is formed by the confluence of two streams, the Chandra and the Bhaga, at Tandi near Keylong. It flows through the Lahaul region and the Pangi Valley.
Key Takeaway: The Ravi River is specifically associated with the Chamba Valley, flowing between the Dhauladhar and Pir Panjal ranges before entering the plains of Punjab.