The powder keg in the balkan’s refers to the

a: invasion of the region by outside forces

b: political instability of the region

c: efforts taken to ease tensions throughout the region

d: large number of munitions factories built in the region.

also p. s.a when you post your question make sure you post the possible answers too. it will make answering your question easier

B. Political instability of the region

Explanation:

The powder keg of Europe or Balkan powder keg was the Balkans in the early part of the 20th century preceding World War I. There were a number of overlapping claims to territories and spheres of influence between the major European powers such as the Russian Empire, the Austro-Hungarian Empire, the German Empire and, to a lesser degree, the Ottoman Empire, the United Kingdom and Kingdom of Italy.