Which of these provisions of the treaty of versailles was the most crucial to what president woodrow wilson sought in the hope that world war i would be a "war to end all wars"? a) freedom of the seas to neutral nations b) the establishment of the league of nations c) burdening germany with heavy reparations to pay for war damages d) forcing germany and the central powers to give up their overseas colonies

I believe it is B. The purpose establishment of the League of Nations was to resolve international conflicts without war. 
Choice A doesn't really make sense because neutral nations don't join war alliances; they remain neutral. Choice C and D actually would lead to more wars because Germany was bitter about being forced to accept the defeat. They further had to pay for the reparations, which wouldn't make anyone happy. 

Sorry, idk! i wish i could ya out : (

Iwill support us side.