Siachen Glacier is situated to the
Explanation
The Siachen Glacier is located in the eastern Karakoram Range, situated directly north of the Nubra Valley where the Nubra River originates from the glacier's meltwaters. Option (a) is a common distractor, but Siachen actually lies to the west of Aksai Chin, just as it lies north of Leh and east of Gilgit. The core concept tested is the precise map-based spatial awareness of strategic geographical features and river systems in the trans-Himalayan region of Ladakh.