Answer:
C. The Great powers trying to prevent unrest in the Balkans from becoming war
Explanation:
The Balkans have been and still are one of the most, if not the most, troublesome regions in Europe. It is a region in which there has been constant tensions, battles, and wars, be it on ethnic, religious, historic, or territorial basis. No wonder that the region is often referred to as the ''Europe's dysfunctional child''. The Great powers have a big interest in the Balkans as it is a region of great strategic importance, but it is also part of Europe, so any larger conflict there can spread across the continent easily. Because of this, the Great powers have constantly been trying to keep the region as quiet as possible and prevent conflicts in it.