সঠিক উত্তর হচ্ছে: কাতার
ব্যাখ্যা: The Organization of the Petroleum Exporting Countries (OPEC) was founded in Baghdad, Iraq, with the signing of an agreement in September 1960 by five countries namely Islamic Republic of Iran, Iraq, Kuwait, Saudi Arabia and Venezuela. They were to become the Founder Members of the Organization. Qatar joined in 1961 & terminated its membership on 1 January 2019.Currently, the Organization has a total of 14 Member Countries.(
https://www.opec.org)