The correct answers are:
B. England and France fought a series of related conflicts which became known as the Hundred Years' War.
C. Wars between Christians and Muslims resulted in the expansion of Christianity and European empires.
E. Cities grew and became centers of business, trade, and learning.
The long war between England and France led to military and technological advancements in both countries, and those advancements were crucial into the developing of their respective societies, and afterwards for the expansion and colonization of big portions of the world.
The wars between the Christians and Muslims resulted into the exploration missions of the Europeans, which actually discovered whole new continents that they colonized and exploited, thus becoming much stronger and wealthier,a s well as spreading the Christianity on other millions of people in the new territories.
The cities started to develop quickly, grew in population and size, and became more influential in their countries, were acting even like mini states into the states. They managed to become very strong economically and had their own military. In this way shaped mainly the larger and more important port cities in the global trade.