In the fifth sentence of the first paragraph (“There is the League of Nations...reduction of armament”), the author comments on the age and effectiveness of the League of Nations primary to explain

A -why the first world war motivated world leaders to form alliances

B- Why current measures may not indefinitely forestall another outbreak of war

C- It’s relationship to his claim that war is unlikely to be abolished immediately

D- it’s relevance to his argument regarding advances in peace preservation efforts

E- it’s significance as an exception to his generalization about human institutions