sqwer2JESUS
contestada

What event sparked World War I?

formation of the Triple Alliance
Serbian assassination of Austrian heir to the throne
sinking of the Lusitania

Respuesta :

The event that set off World War I was the assassination of Archduke Franz Ferdinand of the Austro-Hungarian Empire and his wife Sophie by Gavrilo Princip, a Serbian nationalist, on June 28, 1914 in Sarajevo.

The answer to  this is Serbian assassination of Austrian heir to the throne