Option 1 states that Damin-i Koh in the Rajmahal area was a large area of land that was demarcated and declared to be the land of the Santhals.

The Santhals were an indigenous tribe in India who were known for their agricultural practices. They relied heavily on the land for their livelihood and survival. Damin-i Koh was a significant landholding that was specifically allocated to the Santhals. It was considered their own territory where they could live and cultivate crops.

This allocation of land to the Santhals was an attempt by the British colonial government to establish a settled agricultural community. The idea behind this was to transform the Santhals from a nomadic society to a settled one, and to promote agricultural practices among them. It was a measure taken by the British to exercise control over the tribal communities and to establish their authority over the land.

Overall, Damin-i Koh was a designated area of land for the Santhals to live on and cultivate, as part of British colonial policies towards the indigenous communities.