Classical Economics, as Propounded by Adam Smith and Others, Maintained

Classical economics, as propounded by Adam Smith and others, maintained that

A) government should do as much as possible to ensure the effective functioning of the economy and the welfare of its citizens.
B) the free market and free trade should reign everywhere.
C) tariffs should be erected to safeguard the growing industries of each country.
D) workers, by freely seeking the best wages offered in an unregulated system, would find prosperity for themselves and their families.