Answer:
B)The size of towns grew as trading increased.
Step-by-step explanation:
From the twelfth century, there were profound changes in Europe, trade in the Middle Ages: the rural and closed economy, typical of the feudal era was gradually transformed into an open and commercial economy. Then, industry, markets and money regained importance. This commercial renaissance, which reached its peak in the thirteenth century. These changes led to the increase in population and the development of urban centers.