Among the Factors Leading to an End to Europe's Balance-Of-Power

Among the factors leading to an end to Europe's balance-of-power system was

A) that Germany was a weak state at the center of Europe.
B) that Russia was becoming the leading industrial power.
C) the solidification of previously flexible alliances between the European powers.
D) Italy's invasion of Ethiopia despite warnings from the Concert of Europe.
E) the growth of fascism in Germany and Italy.