I think it’s either A or D
<span>Karl Marx was a German philosopher and revolutionary socialist Karl Marx published The Communist Manifesto and Das Kapital, anticapitalist works that form the basis of Marxism.
Marxism is </span><span>the political and economic theories of Karl Marx and Friedrich Engels, later developed by their followers to form the basis for the theory and practice of communism.</span>
Expanded trade, regional empires, and increased global trade are all effects of which of "<span>b. the transition from river valley civilizations to classical civilization," since classical civilizations engaged in more far-reaching trade and cultural diffusion. </span>
It killed almost 50% of the population. They were devastated. Because there was no cure for it, they turned their faith towards God.
