The Main Problem with the Dual Monarchy in Austria-Hungary Was

The main problem with the Dual Monarchy in Austria-Hungary was that

A) the government was too liberal for the people's tastes.
B) it consisted not of two ethnic groups, but of many, most of whom did not get along well.
C) the Hungarians seized control of the government and did not consider the wishes of other groups.
D) the Austro-Germans rankled under the yoke of the dominant Hungarians.
E) Catholics living within the monarchy felt threatened by the dominance of the Protestant majority.