Concept:Nigeria's aborted Third Republic was built on a deliberately restricted two-party political structure.
Explanation:The aborted Third Republic refers to the transition programme supervised by General Ibrahim Babangida in the late 1980s.
The regime introduced the 1989 Constitution to guide the planned handover to civilian rule.
That Constitution did not allow unlimited registration of political associations.
Instead, it created a two-party system as the official political framework for the republic.
Only two political parties were registered: the Social Democratic Party (SDP) and the National Republican Convention (NRC).
All elections held during that transition period were contested strictly on the platforms of these two parties.
The republic was later annulled before it could be fully completed, hence it is described as aborted.
This shows that Nigeria operated a two-party system during the period of the Third Republic.
Answer:C. two party system