What Occurred Within the Agricultural System at the End of the Roman

What occurred within the agricultural system at the end of the Roman empire?

A) The decline of slave labor resulted in the return to primarily small independent farmsteads.
B) The incidence of plagues drove people from the cities into the countryside and resulted in an intensification of the agricultural economy of the later Roman empire.
C) As life became more precarious, many farmers surrendered full control of their estates and clustered around the protection of large landlords.
D) The state undertook control of the agricultural economy and established state farms staffed by slaves.