What Was the Impact of the Improved Economy After the 10th

What was the impact of the improved economy after the 10th century on the social system of western Europe?

A) The improvements in the agricultural system retarded the development of towns and restricted social mobility.
B) Harsh serfdom became the rule throughout western Europe.
C) The increased pace of economic life created a less rigid structure.
D) Despite the improved economy, the rigid social system associated with feudalism continued to dominate western Europe.