Concept:Decentralisation means the sharing or transfer of governmental powers away from a single central authority.
Explanation:Decentralisation is a key feature of a federal system of government.
In a federal system, governmental powers are constitutionally shared among the federal, state, and local governments.
Each level of government exercises authority over its own areas, which prevents the excessive concentration of power at the centre.
This distribution of authority and responsibilities clearly shows decentralisation.
In contrast, a unitary system concentrates power at the centre, while totalitarian and fascist systems are highly centralised.
Answer:B. federal system of government