Explanation:

- Option 1: Beas

- The Beas River is a major river in northern India, flowing through Punjab.

- It eventually merges with the Sutlej River.

- Option 2: Chenab

- The Chenab River flows through Jammu and Kashmir in India and Punjab in Pakistan.

- It is formed by the confluence of the Chandra and Bhaga rivers.

- Option 3: Jhelum

- Jhelum flows through the Kashmir Valley.

- It is the westernmost river of the Punjab region.

- Option 4: Sutlej

- The Sutlej is the longest of the five rivers of the Punjab region.

- It ultimately joins the Indus in Pakistan.

- Correct Answer: Option 4: Sutlej

- The Sutlej River is the longest tributary of the Indus River.

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