Which is the highest mountain peak in India?

Explanation:

With an elevation of 8,586 metres, Kanchenjunga is India's highest mountain peak and the world's third highest summit (28,169 ft).

In the enormous Himalayan range, Sikkim, the tallest mountain, Kangchenjunga, is located on the boundary between India and Nepal.

Final Answer:

Hence, the correct answer is option (A) i.e. Kanchenjunga.