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

Bthe assassination of Archduke Franz Ferdinand of Austria

Cthe unplanned explosion at an armory in the Bosnian capital of Sarajevo

Dthe inadvertent firing of shots by a Serbian soldier on German troops