The correct option is B Land revenue
The Hoysalas was a kingdom in the south with the decline of the Chalukya kingdom. In order to encourage agriculture, the Hoysalas built innumerable lakes like the Shanti Sagara, Ballalaraya Samudra, Vishnu Samudra etc. In the cities, there used to be guilds among the people following different occupations. Land revenue was the main source of income for the kingdom.