(A) Nationalism
(B) ** Militarism
(C) Alliances
(D) Imperialism
EXPLANATIONS BELOW
Concept note-1: -Militarism is the belief or the desire of a government or a people that a state should maintain a strong military capability and to use it aggressively to expand national interests and/or values.
Concept note-2: -This increase in militarism helped push the countries involved into war. 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.
Concept note-3: -Militarism. Militarism denoted a rise in military expenditure, an increase in military and naval forces, more influence of the military men upon the policies of the civilian government, and a preference for force as a solution to problems. Militarism was one of the main causes of the First World War.
Concept note-4: -Militarism can variously be understood as: an ideology glorifying war; the propensity to use force; military buildup; excessive influence (of either the institution of the military or of the military–industrial complex (MIC)); or the influence of military relations on social relations in general.