(Bad Choice) Federal System
Power is shared by a powerful central government and states or provinces that are given considerable self-rule, usually through their own legislatures.
Examples: The United States, Australia, the Federal Republic of Germany.
(
Best choice) Unitary System
One central government controls weaker states. Power is not shared between states, counties, or provinces.
Examples: China, United Kingdom (although Scotland has been granted self-rule).
Confederal System
(worst choice)
Weak or loose organization of states agrees to follow a powerful central government. Nations can choose to follow or not follow the lead of the weak central government. Examples: The Commonwealth of Independent States (CIS), formerly known as the Soviet Union. Also, Switzerland's canton system and the Confederate States of America (1861-1865).