The correct answer is option 3 - Zamindars. The British revenue system in India, known as the Zamindari system, allowed the British to collect revenue from the agricultural lands. Under this system, the ownership and control of land was granted to the Zamindars, who were mainly landlords or aristocrats.

The Zamindars acted as intermediaries between the British and the peasants. They were responsible for collecting revenue from the peasants and paying a fixed amount to the British. However, the Zamindars often exploited the peasants by charging exorbitant rents and imposing harsh conditions. This allowed the Zamindars to accumulate wealth and increased their power and influence.

The sharecroppers and peasants (options 1 and 2) were the ones who suffered the most under this system. They were forced to pay high rents to the Zamindars and faced dispossession and indebtedness. Agriculture-labor (option 4) refers to the workers who worked on the Zamindars` lands but did not directly benefit from the revenue system.