(A) ** technological developments used during World War I
(B) formation of alliances in World War II
(C) tension between the superpowers during the Cold War
(D) protests against reforms during the Indian independence movement
EXPLANATIONS BELOW
Concept note-1: -The answer is 1. technological developments used during the First World War. I picked this answer because world war 1 was a whole new type of warfare, tanks were invented, gas were first used, etc. Hope this helps.
Concept note-2: -Militarism – the policy of building up armed forces in aggressive preparedness for war and their use as a tool of diplomacy.
Concept note-3: -Which statement best describes Europe before WWI? The formation of opposing alliance systems increased international distrust.
Concept note-4: -Militarism-the glorification of the military. Under militarism, the armed forces & readiness for war came to dominate national policy.