Correct Option
The correct option is Chandra and Bhaga.
Explanation
The Chenab River is the largest tributary of the Indus River system. It originates in the Himalayas within the Lahaul and Spiti district of Himachal Pradesh.
Detailed Analysis:
- Dhauli and Vishnu Ganga is Incorrect: The confluence of the Dhauli and Vishnu Ganga forms the Alaknanda River at Vishnuprayag in Uttarakhand.
- Chandra and Bhaga is Correct: The Chenab is formed by the confluence of two streams, the Chandra and the Bhaga, which originate on opposite sides of the Baralacha La pass. These streams meet at Tandi near Keylong in Himachal Pradesh. Due to this confluence, the river is traditionally known as the Chandrabhaga in this region.
- Nubra and Shyok is Incorrect: The Nubra River is a principal tributary of the Shyok River, flowing through the Nubra Valley in Ladakh.
- Gilgit and Hunza is Incorrect: The Hunza River is a tributary of the Gilgit River, situated in the Gilgit-Baltistan region.
Key Takeaway: The Chenab River is locally called the Chandrabhaga in Himachal Pradesh because it is formed by the merger of the Chandra and Bhaga streams at Tandi.