In the year 1832, the British demarcated a large area of land as Damin-i-koh for settling the Santhals. The Santhals are a tribal community in India. Option 1, 1810, is incorrect as it does not correspond to the correct year. Option 2, 1793, is incorrect as it also does not match the correct year. Option 3, 1885, is incorrect as it is much later than the actual year of demarcation. Therefore, option 4, 1832, is the correct answer.

It is important to note that the demarcation of Damin-i-koh was a significant event in the history of the Santhals. The British government designated this large area of land specifically for the settlement of the Santhal community. This move was aimed at managing and controlling the Santhals` access to land and resources, as well as establishing a more direct British influence in the region. The demarcation of Damin-i-koh had long-term implications for the Santhals` way of life, as it tied them to specific territories and subjected them to British governance.