Nigeria is a member of____________

Analyze the question: We need the option in which every organisation listed is one Nigeria belongs to.

Explain the concept: Check each organisation:

• OPEC: Organisation of the Petroleum Exporting Countries. Nigeria is a member (since 1971).
• NATO: North Atlantic Treaty Organisation, a military alliance of North American and European countries. Nigeria is not a member.
• ECOWAS: Economic Community of West African States. Nigeria is a founding member (1975).
• OAU: Organisation of African Unity (now the African Union). Nigeria is a founding member (1963).
• UNO: United Nations Organisation. Nigeria joined in 1960.
• The Commonwealth of Nations: Nigeria is a member.
• OAS: Organisation of American States. Nigeria is not a member.

Solution, option by option:

• A. OPEC, NATO, ECOWAS: NATO is wrong. ❌
• B. OAU, UNO, ECOWAS: all three are correct. ✅
• C. ECOWAS, NATO, OAU: NATO is wrong. ❌
• D. Commonwealth, OPEC, OAS: OAS is wrong. ❌

Answer: Option B is the only one where every organisation listed includes Nigeria as a member.

Tip: Watch out for the "geography trap" organisations. NATO is for the North Atlantic (Europe and North America) and OAS is for the Americas, so Nigeria is not in either. If you see an organisation tied to another region, eliminate it quickly.