Concept:The Macpherson Constitution of 1951 introduced internal self-government for the regions in Nigeria.
Explanation:Before 1951, the Richards Constitution only divided Nigeria into three regions for convenient administration.
It did not give those regions real control over their own day-to-day government.
The Macpherson Constitution went a step further by setting up regional legislatures and regional executive councils.
Each region was empowered to make laws and administer its own internal matters, such as health, education, and local government.
Therefore, the first time the regions were granted internal authority was under the Macpherson Constitution.
Later constitutions, like the Lyttleton Constitution, built on this by making the regions more autonomous under federalism.
Answer:D. Macpherson Constitution