(A) Militarism
(B) Alliances
(C) ** Immigration
(D) Nationalism
EXPLANATIONS BELOW
Concept note-1: -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-2: -What was the main cause of World War I? World War I began after the assassination of Austrian archduke Franz Ferdinand by South Slav nationalist Gavrilo Princip on June 28, 1914.
Concept note-3: -The World War I which began in the year 1914 CE, resulted in high taxes, increased military expenditure, and deployment of Indians to fight in the war. Indian peasants did not profit as a consequence of the World War I.