The correct answer is C. Addis Ababa.
The Economic Commission for Africa (ECA) is one of the five regional commissions of the United Nations. It was established in 1958 to promote economic and social development in Africa. The ECA’s headquarters is located in Addis Ababa, Ethiopia.
Bangkok is the capital of Thailand and the most populous city in Southeast Asia. Geneva is the second most populous city in Switzerland and the seat of many international organizations, including the United Nations. Baghdad is the capital of Iraq and the largest city in the Arab world.
The ECA’s headquarters is located in Addis Ababa because Ethiopia is a founding member of the United Nations and has a long history of cooperation with the UN. Addis Ababa is also a strategically located city in the heart of Africa.