The correct option is D Nourishment for the emergence of cities that became centres for trade.
According to some sources, human beings realised their rights and duties under the feudal system. It was under this system that certain societies formed their rules. The system also kept the influence of the so-called barbarians in check.
It is also said to have encouraged creative output in literature in England, France, and Germany, and slowly nourished the emergence of cities. They become centres of trade and artecrafts. The status of farmers, however, largely remained the same.