Concept:The 1906 merger of Lagos with the Southern Nigeria Protectorate created a single administrative unit.Explanation:In 1906, the Colony and Protectorate of Lagos was amalgamated with the Protectorate of Southern Nigeria.The new entity was named the Colony and Protectorate of Southern Nigeria.This happened before the later 1914 amalgamation that formed the Colony and Protectorate of Nigeria.Answer:A. Colony and Protectorate of Southern Nigeria