Research in History and Economic History Shows That Before 1880

Research in history and economic history shows that before 1880,

A) there was some government intervention in the private sector of the American economy.
B) there was substantial federal regulation of private business organization but little influence?in the economy otherwise.
C) the regulation and participation that existed were usually of a background nature and were not concerned with the details of day-to-day private business.
D) laissez faire was the rule so far as the federal government was concerned.