What spark started world war i by setting off the powder keg of nationalism that had been building in europe in the period prior to 1914? question 4 options: a. the assassination of king albert i of belgium during an austrian
excursion
b. the assassination of archduke franz ferdinand of austria
c. the unplanned explosion at an armory in the bosnian capital of sarajevo
d. the inadvertent firing of shots by a serbian soldier on german troops