The primary source of federal power to regulate business is the

B. Commerce clause

Explanation:

The Commerce Clause refers to Article 1, Section 8, Clause 3 of the U.S. Constitution, which gives Congress the power “to regulate commerce with foreign nations, and among the several states, and with the Indian". The clause gives Congress the power to control or regulate interstate business within the country and also business with foreign countries also. Activities the Congress has been given control over by the clause includes sale, purchase, or exchange of commodities or the transportation of people, money, or goods between different states or between the US and other countries.

i would say their habit of breaking down.

answer; private store;