Which of the following Nigerian constitutions brought the Northern Provinces into the Legislative Council?

The Richards Constitution is the Nigerian constitution that brought the Northern Provinces into the Legislative Council. The Richards Constitution was enacted in 1946 and introduced a new system of government for Nigeria, which included the establishment of a federal system of government, with three regions: Northern, Western, and Eastern. Prior to the enactment of the Richards Constitution, the Northern Provinces were not represented in the Legislative Council. The Constitution created a central legislative council for Nigeria, with members appointed by the Governor, and a regional house of assembly for each of the three regions, which were partly elected and partly appointed. The Richards Constitution provided the Northern Provinces with limited representation in the Legislative Council, which was a significant development towards greater political representation and participation for the region.