(A) ** Militarism
(B) Alliances
(C) Nationalism
(D) Imperialism
EXPLANATIONS BELOW
Concept note-1: -NAVAL ARMS RACE Britain and Germany were rivals at sea. Colonial rivalry had led to a naval arms race between Britain and Germany. This had seriously worsened relations between both countries. The British-German dispute also led to greater naval co-operation between Britain and France.
Concept note-2: -"Militarism is often referred to as the arms race. The build up of rival alliances was accompanied by an armaments race between the two blocs. Each side believed that it was essential to build up their armies and their stockpile of weapons so as to be stronger than the other side.
Concept note-3: -Known as the Cold War, this conflict began as a struggle for control over the conquered areas of Eastern Europe in the late 1940s and continued into the early 1990s. Initially, only the United States possessed atomic weapons, but in 1949 the Soviet Union exploded an atomic bomb and the arms race began.