D All of the Above
The immediate cause of World War I was the assassination of Archduke Franz Ferdinand of Austria-Hungary in Sarajevo on June 28, 1914. This event led to Austria declaring war on Serbia, leading to a chain reaction of alliances being activated and the start of World War I.
The events that were the IMMEDIATE cause of World War I
A Archduke Franz Ferdinand is assassinated, Austria declares war on Serbia, all the allies join in
B Czar Nicholas is assassinated, Russia declares war on France, all the allies join in
C Woodrow Wilson is assassinated, America declares war on Germany, Russia joins in
D All of the Above
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