Smith is the first critic of the mercantilist doctrine. One of the subjects he inquires is what a country’s prosperity depends on. According to the economics theory that he based on a criticism of Mercantilism, a nation’s prosperity depends on the nation’s production power, whereas Mercantilists think that a nation’s prosperity depends on the mines the nation has. Tat is, a nation’s prosperity depends on the power of producing the wealth needed for a comfortable and untroubled life. The correct option is B.