Answer:
d. federalism
Explanation:
Federalism is a system of government in which a country is divided into several independent region that can regulate themselves. But, each regions must follow the adherence from one central government..
This is a system that currently exist in United States.
We divided our region into 50 states. Each states has the power to create their own legislations depending on their individual needs. But if the federal government make important decisions, the individual states need to follow them.
