The following party systems have been practiced in Nigeria EXCEPT … party

Analyze the question: We need the party system that has NOT been practiced in Nigeria.

Concept: A party system describes how many parties compete for power.

• Multi-party system: Many parties compete. Nigeria practiced this in the First Republic (NPC, NCNC, AG), the Second Republic (NPN, UPN, NPP, GNPP, PRP), and since 1999 (PDP, APC, ANPP and others).
• Two-party system: Two parties compete. It was imposed during the Third Republic (1989-1993) with the SDP and NRC, which were decreed by the Babangida regime.
• Regulated (guided) multi-party system: Parties are allowed but regulated by the government. This was used under the Abacha transition programme (1990s), when five parties were registered, and in the 1999 transition, when INEC regulated registration.
• Zero-party system: This was practiced under Abacha, who banned party politics for a time. It is also associated with military rule, when all political parties were dissolved or banned. In Nigeria, military regimes suspended party activity, so it effectively existed as a "no-party" period.
• One-party system: Only one party is legally allowed to exist. Nigeria has never formally adopted this. Even during the military era, the aim was never a single legal party. Some regions had dominant parties, such as the NPC in the North, but other parties were still legal.

Solution: Going through the options:

• A. Multi: practiced.
• B. One: never practiced.
• C. Regulated multi: practiced.
• D. Two: practiced (SDP and NRC).
• E. Zero: it is argued that military rule is a form of "zero party" system, so it counts as practiced.

The party system that has not been practiced is the one-party system.

Answer: B

Tip: In Nigeria, remember the pattern "Multi → Two (SDP/NRC) → Multi again". The one-party state was never adopted, even though some regions were dominated by a single party. For "EXCEPT" questions, find the options you can match to a real period in history, and the leftover one is your answer.