D. is the best answer i am pretty sure it is D. bc it is to comapre
The event that ultimately led to World War I was the assassination of Franz Ferdinand and this led to war across Europe.
<h3>What is World War I?</h3>
Your information is incomplete as the options aren't given. Therefore, an overview will be given.
It should be noted that World War I simply means the first world war that occured between 1914 and 1918. The event that ultimately led to World War I was the assassination of Franz Ferdinand.
Learn more about World War I on:
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History .................
