The assassination of Archduke Franz Ferdinand is to WWI as is to WWII.
A. Japan invades Manchuria
B. Italy invades Ethiopia
C. Germany invades Poland
D. Germany invades Austria

The murder of Archduke Franz Ferdinand outraged Austria-Hungary. ... Austria-Hungary was furious and, with Germany's support, declared war on Serbia on July 28. Within days, Germany declared war on Russia—Serbia's ally—and invaded France via Belgium, which then caused Britain to declare war on Germany.

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