Concept:The Clifford Constitution of 1922 first introduced the elective principle in Nigeria, but it was limited to only two urban centres.
Explanation:Before 1922, all members of the legislative council were appointed by the governor.
The Clifford Constitution created a legislative council with a small number of elected African members.
These members were chosen through elections held only in the colony areas.
The two cities permitted to hold these elections were Lagos and Calabar.
Lagos had a long history of British administration, while Calabar was an important commercial and administrative centre in the Eastern Provinces.
Other cities like Kano, Enugu, and Ibadan were not included in this initial elective arrangement.
Thus, the elective principle under Clifford's constitution applied specifically to Lagos and Calabar.
Answer:C. Lagos and Calabar