Why the answer is A, and why the others tempt you.
## The reasoning
Nigeria is a major oil-producing country in Africa — one of the continent's largest. **OPEC (Organization of the Petroleum Exporting Countries)** is a coalition formed specifically for oil-producing nations to coordinate petroleum policies. Nigeria joined OPEC in 1971 because of its significant crude oil exports. This membership makes perfect sense: oil nations work together to influence global oil prices and production levels.
## Why the wrong options tempt you
**EU (European Union)** — You might pick this because you've heard of Nigeria having historical ties with Europe (colonial past with Britain). But the EU is exclusively for European countries geographically located in Europe.
**NATO (North Atlantic Treaty Organization)** — This sounds "international," but it's a military alliance for North American and European nations. No African country is a member.
**ASEAN (Association of Southeast Asian Nations)** — The name gives it away: *Southeast Asian* nations like Indonesia, Thailand, Singapore. Nigeria is in West Africa, not Asia.
## Quick takeaway
**Match the organization to Nigeria's strength: we export oil, so we're in OPEC — the oil producers' club.**
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