(A) Nationalism
(B) Imperialism
(C) Militarism
(D) Archduke Franz Ferdinand’s assassination
(E) ** All of the above
EXPLANATIONS BELOW
Concept note-1: -The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. In June 1914, a Serbian-nationalist terrorist group called the Black Hand sent groups to assassinate the Archduke.