(A) Buddy pact
(B) Formal friends
(C) ** Alliance
(D) Blood brothers
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: -The Triple Alliance was an agreement between the countries of Germany, Austria-Hungary and Italy and the Triple Entente was an agreement between the countries of England, France, and Russia.
Concept note-3: -Alliances are formal agreements between two or more nations. In national defense, they’re promises that each nation will support the other, particularly during war.
Concept note-4: -World War I had two main factions: the Central Powers, which included Germany, Austria-Hungary, Bulgaria and the Ottoman Empire; and the Allies, which included France, Great Britain, Russia, Italy, Japan and later, the United States.
Concept note-5: -allies. an alliance of nations joining together to fight a common enemy. axis, bloc. a group of countries in special alliance. Allies.