The correct answer is: A. Switzerland.
The World Council of Churches (WCC) is a Christian organization founded in 1948. It is a fellowship of 352 churches in more than 110 countries, representing over 580 million Christians. The WCC’s headquarters are located in Geneva, Switzerland.
The WCC’s mission is to promote Christian unity, to serve as a common witness to the gospel of Jesus Christ, and to work for justice, peace, and the integrity of creation. The WCC’s work is carried out through a variety of programs and initiatives, including theological reflection, interfaith dialogue, development cooperation, and advocacy for human rights.
The WCC is a member of the World Communion of Reformed Churches, the World Methodist Council, and the All Africa Conference of Churches. It is also a partner of the United Nations and other international organizations.
The WCC has been criticized by some for its perceived lack of theological clarity and its support for controversial causes, such as the ordination of women and the blessing of same-sex unions. However, the WCC remains a significant force in the global Christian community.
The other options are incorrect because the World Council of Churches is not headquartered in those countries.