(A) Nationalism
(B) Imperialism
(C) ** Alliances
(D) Militarism
EXPLANATIONS BELOW
Concept note-1: -alliance, in international relations, a formal agreement between two or more states for mutual support in case of war.
Concept note-2: -allies. an alliance of nations joining together to fight a common enemy. axis, bloc. a group of countries in special alliance. Allies.
Concept note-3: -: one that is associated with another as a helper : a person or group that provides assistance and support in an ongoing effort, activity, or struggle.
Concept note-4: -countable noun. A country’s ally is another country that has an agreement to support it, especially in war.
Concept note-5: -associate, colleague, friend, partner, accessory, accomplice, coadjutor, collaborator, confederate, co-worker, helper.