সঠিক উত্তর হচ্ছে: ২১
ব্যাখ্যা: Asia-Pacific Economic Cooperation (APEC) is an inter-governmental forum for 21 Pacific Rim member economies. Headquarters: Singapore, Founder: Bob Hawke, Founded: November 1989, Canberra, Australia\n\nThe Organization of the Petroleum Exporting Countries (OPEC) is an intergovernmental organization of 14 nations, founded in 1960 in Baghdad by the first five members, and headquartered since 1965 in Vienna, Austria.