Which military action led to the start of World War I?

A. The assassination of Archduke Franz Ferdinand of Austria-Hungary.
B. The invasion of Belgium by Germany.
C. The sinking of the RMS Lusitania.
D. The bombing of Pearl Harbor.



Answer :

Final answer:

The assassination of Archduke Franz Ferdinand triggered a chain reaction of war declarations that led to the start of World War I.


Explanation:

The military action that led to the start of World War I was the assassination of the Austrian Archduke Franz Ferdinand in 1914. This event triggered a chain reaction of war declarations, with Austria-Hungary declaring war on Serbia, followed by Russia declaring war on Austria-Hungary, and then Germany declaring war on Russia and France. The Great War began as a result of these interconnected alliances and conflicts.


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