How did the alliance system in Europe contribute to the start of World War I?

Question

Responses
A The alliance system helped nations secure their national treasuries.The alliance system helped nations secure their national treasuries.
B The alliance system was a failed attempt at diplomacy to keep the peace.The alliance system was a failed attempt at diplomacy to keep the peace.
C The alliance system kept nations divided politically promoting hostility.The alliance system kept nations divided politically promoting hostility.
D The alliance system forced great nations to go to war when their allies did.The alliance system forced great nations to go to war when their allies did.

Answer 1

D The alliance system forced great nations to go to war when their allies did.

The alliance system in Europe prior to World War I created a situation where a conflict involving one nation could quickly involve its allies, leading to a larger, more widespread war. When Austria-Hungary declared war on Serbia, Russia mobilized in defense of Serbia due to their alliance, which in turn led Germany to declare war on Russia, and the conflict escalated to include multiple nations across Europe.