Solution:The Permanent Settlement was a Zamindari System was introduced by Cornwallis in 1793. It was introduced in the provinces of Bengal, Bihar, Orissa and Varanasi.
But it was not extended to other regions because the increase in agricultural prices after 1810 increased the value of the harvest while the Permanent Settlement disallowed an increase in the State's share.
The East India Company found it expedient to settle directly with the ryots and David Ricardo, a classical economist who wrote about the theory of comparative advantage, theory of rents, etc. also influenced the policymakers. Therefore, option (d) is the correct answer.