Answer: A. Germany's desire for colonies overseas provoked military incidents with established imperial powers.
Step-by-step explanation:
By the time Germany united under Prussia to become a nation in 1871, the other European powers had already laid claims to sizeable domains in the world and Germany felt that they needed to catch up.
They therefore embarked on a mission to get their own overseas colonies in a world already dominated by established powers and this provoked military incidents with said powers.