The Athens would continuously purchase land and the Peloponnesus would be very angry.
The answer is:
B) each country was responsible for managing its own affairs.
The Austro-Hungarian Empire was a constitutional monarchy created in 1867, in which the two kingdoms of Austria and Hungary were ruled by the same monarch: Franz Joseph I. Each separate state had their own parliament and distinct governmental powers, although both shared the same ministries of war, Finance and Foreign Affairs.
The best answer is B) Difficulties in royal succession.
One issue that the Mongol Empire had was a lack of a system of orderly succession when a ruler's end came. Future Islamic Empires, influenced by the Mongol ruling traditions, often experienced similar problems.
League of nations C is the right answer