The correct option is The Indus.
Explanation
The Himalayan drainage system consists of three major river systems: the Indus, the Ganga, and the Brahmaputra. The Indus River System covers the northwestern region of the Indian subcontinent.Detailed Analysis:
- The Indus: Originating near Lake Mansarovar in Tibet, the Indus enters India in the Ladakh district. It flows in a north-westerly direction between the Ladakh and Zaskar ranges. The Indus is considered the westernmost of the Himalayan rivers in India.
- The Jhelum, Chenab, and Satluj: These are major tributaries of the Indus system. Within the Indian territory, they flow to the south and east of the main Indus river trunk. While they eventually join the Indus in Pakistan (forming the Panjnad), their courses within the Himalayan region of India are situated eastward relative to the main Indus river's entry and flow through Ladakh.
Key Takeaway:
The Indus is the westernmost of the Himalayan rivers in India, whereas the Brahmaputra marks the easternmost extent of the Himalayan drainage system.