The correct answer is: c) Ladakh.
Losar is the Tibetan New Year, which is celebrated in Ladakh, a region of India. It is a time for family and friends to come together and celebrate the beginning of a new year. The festival is marked by feasting, dancing, and singing.
Jammu is a region of India that is predominantly Hindu. Kashmir is a region of India that is predominantly Muslim. Gilgit-Baltistan is a region of Pakistan that is predominantly Muslim.
Losar is a Buddhist festival, so it is not celebrated in Jammu or Kashmir, which are predominantly Hindu regions. It is also not celebrated in Gilgit-Baltistan, which is predominantly Muslim. Therefore, the only region where Losar is celebrated is Ladakh, which is a Buddhist region.