Final answer:
Karl Marx criticized market economies for giving workers too little economic power, leading to exploitation by the bourgeoisie who owned the means of production.
Step-by-step explanation:
One of Karl Marx's major criticisms of market economies, specifically within the system of capitalism, was that: D. workers had too little economic power. Marx believed that the capitalist system was under the control of the bourgeoisie, who owned the means of production and exploited the working class or proletariat. By paying wages that were significantly less than the value of the labor, employers acquired surplus value, which they used to further strengthen their economic and political power. Marx theorized that this imbalance of power would eventually lead to the collapse of capitalism and the rise of a socialist state governed by the workers, leading to a classless society.