সঠিক উত্তর হচ্ছে: ভারত
ব্যাখ্যা: The D-8 Organization for Economic Cooperation (Headquarters: Istanbul, Turkey), also known as Developing-8, is an organisation for development co-operation among the following countries: Bangladesh, Egypt, Nigeria, Indonesia, Iran, Malaysia, Pakistan, and Turkey. The establishment of D-8 was announced officially through the Istanbul Declaration of Summit of Heads of State/Government on June 15, 1997. (
https://developing8.org/about-d-8/brief-history-of-d-8/)