The correct answer is A. Bhaga valley.
Mukkila glacier is located in the Bhaga valley, which is a tributary of the Chenab River. The Bhaga valley is a beautiful and remote valley in the Himalayas, and it is a popular destination for trekking and mountaineering. The Mukkila glacier is one of the largest glaciers in the Bhaga valley, and it is a popular destination for hikers and climbers.
The other options are incorrect. Sirmaur is a district in the Indian state of Himachal Pradesh. Dharamshala is a town in the Indian state of Himachal Pradesh. Larji is a village in the Indian state of Himachal Pradesh.