what spark started world war I by sitting off the powder keg of nationalism that has been building in europe in the period prior to 1914?
A: the assassination of Archduke Franz Ferdinand of Austria.
B: the assassination of King Albert I of Belgium during an Austrian excursion.
C: the inadvertent firing of shots by a Serbian soldier on german troops.
D: the unplanned explosion at an armory in the Bosnian capital of Sarajevo.
