(A) Alliances
(B) ** Nationalism
(C) Industrialism
(E) NO CAUSE AT ALL
EXPLANATIONS BELOW
Concept note-1: -Indeed, Serbian nationalism created the trigger cause of the conflict: the assassination of the heir to the Austro-Hungarian throne, Archduke Franz Ferdinand. Ferdinand and his wife were murdered in Sarajevo by Gavrilo Princip, a member of the Bosnian Serbian nationalist terrorist organization, the Black Hand Gang.
Concept note-2: -Wanting to destroy Austro-Hungarian rule in the Balkans and to unite the South Slav peoples into a federal nation, he believed that the first step must be the assassination of a member of the Habsburg imperial family or a high official of the government.
Concept note-3: -Just hours after narrowly escaping an assassin’s bomb, Archduke Franz Ferdinand, the heir to Austro-Hungarian throne and his wife, the Duchess of Hohenberg, are killed by Gavrilo Princip. A month later, Austria-Hungary declares war on Serbia and Europe rapidly descends into chaos.