Interwar -Although Nationalism Was a Significant Force Prior to World War

Interwar
-Although nationalism was a significant force prior to World War I, Eastern European nations struggled to solidify because of which of the following?

A) They were the product of war rather than unified movements.
B) The basic implements of democracy were missing.
C) Most of them were content to be part of an empire.
D) Their regionally unified culture was fractured by the creation of nations.
E) They were constantly facing threats of foreign invasion.