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

What was the main problem with the dual monarchy in Austria-Hungary?

A) The government was too liberal for the people's tastes.
B) The two nations were independent except for foreign policy, defense, and some financial matters.
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.