The correct answer is option 'C' - Indus. The Sutlej, Beas, Ravi, Chenab, and Jhelum are the major tributaries of the Indus River. Let's delve into the details of this answer.

The Indus River:
The Indus River is one of the longest rivers in Asia, flowing through China, India, and Pakistan. It originates in the Tibetan plateau in China and flows through the northern regions of India and Pakistan before emptying into the Arabian Sea.

Tributaries of the Indus River:
1. Sutlej River: The Sutlej River is a major tributary of the Indus River. It originates in Tibet and flows through the Indian states of Himachal Pradesh and Punjab before entering Pakistan and joining the Indus River near the city of Mithankot.

2. Beas River: The Beas River is another significant tributary of the Indus River. It originates in the Himalayas in Himachal Pradesh, India, and flows through Punjab before meeting the Sutlej River in Pakistan.

3. Ravi River: The Ravi River is a transboundary river that flows through northwestern India and eastern Pakistan. It originates in the Himalayas in Himachal Pradesh and joins the Chenab River in Pakistan, which is also a tributary of the Indus River.

4. Chenab River: The Chenab River is one of the major tributaries of the Indus River. It originates in the Himalayas in Himachal Pradesh, India, and flows through Jammu and Kashmir before entering Pakistan. The Chenab River joins the Jhelum River near Trimmu in Pakistan.

5. Jhelum River: The Jhelum River is a tributary of the Chenab River and ultimately the Indus River. It originates in the Kashmir Valley and flows through the Indian-administered territory of Jammu and Kashmir before entering Pakistan.

Importance of the Indus River and its Tributaries:
The Indus River and its tributaries play a crucial role in the irrigation and agriculture of the regions they pass through. These rivers provide water for drinking, agriculture, and hydropower generation. They also have significant cultural and historical importance, being the lifelines of the civilizations that thrived along their banks, such as the Indus Valley Civilization.

In conclusion, the Sutlej, Beas, Ravi, Chenab, and Jhelum are major tributaries of the Indus River. These rivers contribute to the flow, ecological balance, and sustenance of the Indus River basin, making them vital for the regions they traverse.