According to the excerpt, the league of nations was important for preventing war. Thus the correct answer is B.
What was the League of Nations?
In 1919, the league of nations was established as an international organization to promote world peace and prevent war and encourage harmony in the world.
Democratization, collective security, resolving international issues through settlement diplomacy, and enhancing global welfare were among the League's objectives.
Therefore, option B preventing war is the correct answer.
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