A. successfully opposed British imperialism
B. successfully managed monopoly over trade which the British found irksome
C. succeeded Ovonramwen
D. transformed Benin city into a city-state
Correct Answer: Option D
D. transformed Benin city into a city-state
Explanation
Oba Ewuare is notable for having transformed Benin city into a City-State from a military fortress built by the Ogisos, protected by moats and walls. His era is notable, being the first Golden Age Oba.