Which of the Following Was NOT an Important Factor in the Weakness

Which of the following was NOT an important factor in the weakness of the League of Nations?

A) the League's inability to coordinate coherent, international action to limit the effects of the Great Depression
B) the unwillingness of important members, like Britain and France, to enforce League sanctions against aggressors, by force if necessary
C) the ability of states to continue defending their own vital interests without a higher authority to impose disarmament treaties or peace agreements
D) the absence of crucial nations from its membership, including the Soviet Union and the United States
E) the moral and legal failure of the League to establish a lasting, binding peace