Answer:
b. is one applied in state regulation of interstate commerce.
Step-by-step explanation:
In this context, the clause of commerce of constitutional origin, imports a legal center of imputation of powers in favor of the Federal State, or what is the same, of restriction for the premises, with an unimaginable scope, because in it - as we will see - It fits all assumptions of economic activity, whether heavily intervened by the State, or, where appropriate, openly liberalized. So that all commercial activity, whatever its state regulation, is framed in the assumptions of this device. But it is more, in her the regulation of all current public service or that in the future could be created is inserted.
Normally it is pronounced that there are as many different forms of federalism as countries ascribe to this particular form of state, which is determined by the dissimilar expansion of powers between each of the structures that comprise it, central and local. In some, more centralized ones, the balance of the distribution of competences is inclined towards the side of the central State, while in others, more peripheral, it is towards the subunits that conform it, and this is called the balancing test.