Countries are run by constitution. Under the U.S. Constitution, the federal government has the power to regulate commercial activities among the states.
The Commerce Clause of the United States Constitution is known to be one that gives the Congress power to monitor interstate and foreign commerce.
The meaning of this language shows that a limited power to monitor commercial trade between persons in one state and also people outside of that state is given to them.
Note that Congress can monitor every commercial enterprise in the United States.
Therefore, option b is correct.
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