(A) alliances.
(B) nationalism.
(C) militarism.
(E) Imperialism.
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.
Concept note-2: -Expert-Verified Answer. Militarism, Alliances and Imperialism are the cause of World War I. liberalism is not the cause of World War I.
Concept note-3: -The main causes of WWI were nationalism, imperialism, militarism, and the system of alliances. What is Nationalism? Nationalism occurs when the citizens of a country exhibit strong loyalty and devotion to their nation.