Which one of the following is the highest mountain peak?

Based on the provided elevations, K2 (also known as Mount Godwin-Austen) is the highest mountain peak among the given options, standing at 8,611 metres [t3, t5, t8]. It is the second-highest mountain in the world after Mount Everest [t6, t8]. In comparison, Kanchanjunga (or Kanchenjunga) is the third-highest peak globally with an elevation of approximately 8,586 to 8,598 metres [c1, t1, t5]. Nanga Parbat follows with an elevation of 8,125 to 8,126 metres [c1, t2], and Nanda Devi is the lowest of the four, reaching 7,816 to 7,817 metres [c1, t1, c3]. While K2 is located in the Karakoram Range [t4, t8], the others are part of the Himalayan range. Therefore, K2 is the highest peak listed.

Sources

1. [1] https://en.wikipedia.org/wiki/List_of_mountains_by_elevation
2. [2] CONTEMPORARY INDIA-I ,Geography, Class IX . NCERT(Revised ed 2025) > Chapter 2: Physical Features of India > The Himalayan Mountains > p. 8
3. [3] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 2: Physiography > 1. The Kashmir Himalaya > p. 15