Correct option is D
"Crystallized Labor" means labor that is embodied in a commodity.
This concept is part of Marx's Labor Theory of Value.
Marx believed that all economic value in commodities arises from human labor.
This idea critiques how capitalism exploits labor by not compensating the worker fully for their contribution.
Marshall (A): Alfred Marshall was a neoclassical economist known for his work on supply and demand, price elasticity, and marginal utility.
Keynes (B): John Maynard Keynes developed Keynesian economics, focusing on aggregate demand, employment, and government intervention in the economy.
Mill (C): John Stuart Mill contributed to utilitarianism and classical economics, especially focusing on liberty, individual rights, and utilitarian ethics.