Which statement BEST fits in the missing event box of this World War I flow chart?

Responses
A Archduke Franz Ferdinand was assassinated.Archduke Franz Ferdinand was assassinated.
B Fort Sumter was attacked by German U-boats.Fort Sumter was attacked by German U-boats.
C Woodrow Wilson created the League of Nations.Woodrow Wilson created the League of Nations.
D France refused to sign the Treaty of Versailles.France refused to sign the Treaty of Versailles.

1 answer

The statement that BEST fits in the missing event box of the World War I flow chart is:

A. Archduke Franz Ferdinand was assassinated.

This event is widely recognized as the catalyst that triggered the outbreak of World War I. The other options refer to events that are either related to World War II or occurred after the conclusion of World War I.