Explanation:

- Option 1: Namcha Barwa

- Located in Tibet, not in India.

- Altitude: 7,782 m.

- Option 2: Kamet

- Located in Uttarakhand, India.

- Altitude: 7,756 m.

- Third highest mountain in India.

- Option 3: Nanda Devi

- Located in Uttarakhand, India.

- Altitude: 7,816 m.

- Highest peak entirely within India, but not the highest overall.

- Option 4: Makalu

- Located on the Nepal-Tibet border.

- Altitude: 8,485 m.

- Not located in India.

- The highest peak in India is actually Kangchenjunga at 8,586 m, but from these options, Nanda Devi is highest within India, though not the highest if considering borders.