Final answer:
The Treaty of Versailles was the diplomatic agreement aimed at preventing future conflicts after World War I. Along with other international efforts like the Washington Naval Conference and the Kellogg-Briand Pact, it was designed to prevent another global war, though their effectiveness was ultimately limited.
Step-by-step explanation:
Preventing a Second World War and the Treaty of Versailles
The diplomatic agreement signed after World War I aimed at preventing another global conflict was the Treaty of Versailles. This treaty, along with other measures such as the League of Nations, was part of the international efforts to maintain peace post-World War I. Three courses of action that were implemented to prevent a Second World War included the Washington Naval Conference of 1921-1922, which aimed to reduce naval armaments; the Four Power Treaty, which saw nations agreeing to avoid territorial expansion in Asia; and the Kellogg-Briand Pact of 1928, which sought to make war illegal. While these actions were intended to lessen the chances of conflict, none committed nations to enforce these rules, which ultimately limited their effectiveness.
The correct answer to the multiple-choice question provided is option (a): Treaty of Versailles.