Which constitutional amendment introduced the six geopolitical zones in Nigeria?

The correct answer is **none of the above**. None of the mentioned constitutional amendments introduced the six geopolitical zones in Nigeria. The creation of the six geopolitical zones in Nigeria was not achieved through a constitutional amendment. Rather, it was a political decision made by the government in 1976 during the administration of General Murtala Ramat Mohammed. The aim was to promote balanced development, administrative efficiency, and foster unity among the diverse ethnic and cultural groups in the country. The six geopolitical zones are North-West, North-East, North-Central, South-West, South-East, and South-South. It is important to note that the geopolitical zones are not explicitly provided for in the Nigerian constitution. They serve as a framework for administrative convenience and the distribution of resources, but they do not have a legal or constitutional basis.