Explanation:

- The Himalayas are divided into different sections based on the river valleys that separate them.

- The Satluj River is one of the longest rivers in India and an important part of the Indus river system.

- Option 2: Kali River is indeed the correct answer. The Kumaon Himalayas lie between the Satluj and Kali rivers.

- The Indus River is located further west and does not border the Kumaon Himalayas.

- The Brahmaputra River is situated in the eastern Himalayas, far from the Kumaon region.

- The Teesta River flows in the eastern Himalayas, in Sikkim and West Bengal, and is not relevant to the Kumaon region.