D. Adam Smith
His book, The Wealth of Nations, promoted capitalism and laissez faire economics.
Choice A is incorrect because John Locke was not an economist but a political theorist noted for his writings on social contract theory and natural rights.
Choice B is incorrect because Karl Marx was the originator of communism (the opposite of a free market) with his Communist Manifesto.
Choice C is incorrect because Charles Dickens was a British author of many great works of fiction.
Hope this helps!!
