The correct options are
A The high revenue rates discouraged zamindars and peasants in investing in improvements.
C The Ryotwari system was based on the Ryot, which means cultivator.
The high revenue rates discouraged zamindars and peasants in making improvements and also observed that owning land and renting land could generate a profit. The Ryot meaning cultivator was the basis of the Ryotwari system, which helped in creating better environments for cultivators.