According to the Text,what Lies at the Root of Capitalism's

According to the text,what lies at the root of capitalism's concept of surplus value?

A) The values of expert craftsmen ensure the production of commodities with great quality.
B) Surplus is the amount of money left over after a worker has paid the bills.
C) The value of items produced by workers exceeds the cost of material and wages.
D) Elegant furniture composed of many parts is more valuable than simpler products.