Which of the Following Was One of the Many Reasons

Which of the following was one of the many reasons for the rise of the feudal system in Europe?

A) Feudalism reflected a need for widespread economic activity and the need for workers.
B) Feudalism arose out of fears over more invasions and a desire for a sense of order and protection.
C) Feudalism allowed for the growth of large military forces used for conquest of new lands.
D) Feudalism was a reaction to a desire to spread Roman culture.
E) Feudalism was the result of the desire to impose Germanic customs on all of western Europe.