Why was the Balkan region referred to as the "Powder Keg of Europe" prior to World War 1?' O
A.
The aggression of the Ottoman
Empire was disrupting
the balance of power.
O
B.
Yugoslavia was invading its neighboring countries.
C.
Nationalistic and imperialistic rivalries were increasing.
D.
The area was the leading supplier of military equipment to the rest of the world.