All of the Following Are Reasons the Alliance System Before

All of the following are reasons the alliance system before World War I was dangerous EXCEPT:

A) the high number of allies made calculations about what others would do more difficult.
B) the alliances created mutual deterrence by raising the expected costs of war.
C) the Great Powers depended on their allies for their security.
D) the Great Powers were uncertain whether allies would actually come to their aid in a war.
E) a small conflict could escalate into a general war.