What Was the Basic Problem Shared by the Habsburg,Russian,and Ottoman

What was the basic problem shared by the Habsburg,Russian,and Ottoman empires?

A) Multiethnic,religiously diverse populations made them vulnerable to the spread of nationalist ideals.
B) The vast geographic expanse of their empires overextended their militaries and strained their economies.
C) They modernized too rapidly and could not cope with the financial demands of their new industries.
D) Harsh political repression provoked terrorist acts and weakened their support among the middle class.
E) Conflict between the monarchy and the army paralyzed their governments and facilitated popular revolts.