What event was happening in europe that led to such a antagonist atmosphere between the proletariat and the bourgeoisie?

a: the revolutionary war

b: the reformation

c: the industrial revolution

d: the norman invasion

(i think it's a or c)

first second and third

explanation:

world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

explanation: