The correct answer is: C. Moravian Mission.
The Moravian Mission was a Protestant Christian missionary society founded in 1732 in Herrnhut, Saxony, Germany. The mission was active in many parts of the world, including India, Africa, and the Americas. In the 19th century, the Moravian Mission established a school in Leh, Ladakh. The school was initially called the Moravian Mission School, but it was later renamed the Leh Moravian School. The school was a boarding school for boys and girls. It offered a basic education in English, mathematics, science, and history. The school also taught the Ladakhi language and culture. The Moravian Mission School was a significant institution in the history of education in Ladakh. It was one of the first schools to be established in the region, and it played a role in promoting education and literacy among the Ladakhi people.
The other options are incorrect.
Option A is incorrect because the Buddhist Organisation did not establish the first school in Leh.
Option B is incorrect because the Dogra King ‘Hari Singh’ did not establish the first school in Leh.
Option D is incorrect because the first school in Leh was established by the Moravian Mission.