Concept:The British colonial conquest of Yorubaland happened gradually, and Abeokuta resisted British rule longer than any other major city-state.
Explanation:Lagos fell first because the British annexed it as a colony in 1861.
Later treaties and military expeditions placed both Oyo and Ibadan under British control.
Abeokuta, however, secured treaties that preserved its internal independence for many more years.
The Egba chiefs repeatedly rejected British demands and refused to surrender their sovereignty quickly.
Because of this sustained opposition, Abeokuta was the last Yoruba city-state to be brought fully under British colonial rule in the late 19th century.
Consequently, the other options do not fit the historical sequence of events.
Answer:A. Abeokuta