Concept:The Clifford Constitution of 1922 is mainly remembered for creating a central legislative council for Nigeria.
Explanation:Before 1922, Nigeria did not have one unified central legislative council.
The Clifford Constitution established a new Legislative Council for the Colony and Southern Protectorate of Nigeria.
This council allowed limited African representation through the elective principle.
However, Northern Nigeria was not fully included in this council.
Thus, the constitution's major achievement was that it set up the legislative council itself.
Answer:D. establishing the legislative council