The correct answer is: C. 70,249 sq km.
The Union Territory of Ladakh is a landlocked region in the Himalayas, located in the northwestern part of India. It is bordered by the Chinese-administered Aksai Chin to the north, the Tibet Autonomous Region to the east, the Indian state of Jammu and Kashmir to the south, and the Pakistani-administered Gilgit-Baltistan to the west. The total area of Ladakh under Indian administration is 70,249 square kilometers.
Option A is incorrect because it is the area of the Union Territory of Ladakh under Chinese administration. Option B is incorrect because it is the area of the Indian state of Jammu and Kashmir. Option D is incorrect because it is the area of the Pakistani-administered Gilgit-Baltistan.