Northern mountain is the part of a –

Option A is incorrect. Himalayan mountains are called young fold mountains, as they were formed by the convergence of tectonic plates, and is relatively young. Aravalli mountains are called old mountains, as they were formed millions of years before Himalayas, and have gentler slopes due to erosional activities. Geographically, these two mountain ranges do not come in contact. Himalayas lie to the north of the plains, to which Delhi is a part of, and the Aravalli start from Delhi and extends south-west to Gujarat. Thus, Himalayas cannot be part of the Aravalli range, either in form or geographical location.

Option B is correct. The Northern Himalayas extend like an arc from the west to east of India forming a natural border. The western potion of the Himalayas converges with the Pamir Mountain System, originating from the Pamir Knot and extending till Arunanchal Pradesh.

Option C is incorrect. Armenian Plateau lies in Central Asia and is nowhere close to the Himalayan Mountains. Hence the Himalayas cannot be said to be a part of the Armenian Plateau.

Option D is incorrect. Kailash Parbhat is a peak in the Himalayan mountain range. Therefore, Kailash Parbhat is a part of the Northern Mountains (Himalayas), and not the other way around.