Answer:
d) Unitary
Step-by-step explanation:
A unitary state is ruled as a restricted strength in which the central government is finally paramount and any governmental units here (sub-national states) practice solely the authorities that the primary administration prefers to assign.
The preponderance of states in the world has a unitary system of power. From UN members countries, out of 193, 165 countries have a unitary system.
Unitary states are distinguished with federal states. In such states, the sub-national authorities distribute powers with the central government as same actors by a signed charter, to which the permission of both is needed to make alterations. This indicates that the sub-national systems have a right of occurrence and controls that cannot be unilaterally modified by the central government.