A Significant Source of Conflict Between Russia and Austro-Hungary Was

A significant source of conflict between Russia and Austro-Hungary was

A) Austria's attempts to dominate the Balkans, which undercut Russia's role as protector of the Slavic peoples.
B) Austro-Hungary eyeing territories along the Black Sea in anticipation of the demise of the Ottomans.
C) Austrian annexation of Albania.
D) Austria trying to dominate Christians in the Ottoman Empire, which Russia felt was its domain because of Orthodox Christianity.
E) Austria declaring an open-border policy to Jews escaping Russian persecution.