Nigeria is a member of which oil cartel?

**The reasoning** Nigeria is a major oil-producing nation and belongs to **OPEC (Organization of the Petroleum Exporting Countries)**. OPEC is specifically an oil cartel — a group of countries that coordinate oil production and pricing to stabilize global markets. Nigeria joined OPEC in 1971 and remains one of Africa's key members alongside Angola, Libya, Algeria, and others. The word "cartel" + "oil" immediately points you to OPEC. **Why the wrong options tempt you** - **WTO (World Trade Organization)** deals with global trade rules across all goods, not specifically oil cartels - **NATO (North Atlantic Treaty Organization)** is a military alliance of Western nations — Nigeria isn't a member - **EU (European Union)** is a political and economic union of European countries — obviously Nigeria isn't in Europe! These organizations are famous internationally, so they might pop into your head during exam pressure. But none are oil-specific cartels. **Quick takeaway** When you see "oil cartel," think OPEC immediately — it's the only organization specifically designed to coordinate petroleum production among member nations like Nigeria.