Nigeria is a major financier of which of the following?

Nigeria is a major financier of the African Development Bank (AfDB). The African Development Bank is a regional development bank that provides financing and other forms of support to African countries. It was established in 1964 and has its headquarters in Abidjan, Côte d'Ivoire. The AfDB is dedicated to promoting economic and social development in Africa and reducing poverty on the continent. Nigeria is one of the founding members of the AfDB and has been a significant contributor to the bank's resources since its inception. As of 2021, Nigeria is the AfDB's largest shareholder, with a 9.3% stake in the bank. This means that Nigeria has a significant say in the bank's decision-making processes, including the allocation of funds for development projects in Africa. While Nigeria is also a member of other international organizations like the International Bank for Reconstruction and Development (IBRD), the United Nations Organization (UNO), and the Organization of the Petroleum Exporting Countries (OPEC), it is not a major financier of these organizations in the same way that it is of the AfDB.