Concept:The significant political change under Oba Ewedo was the strengthening of the Oba's control over Benin's government.
Explanation:Before Ewedo, the Uzama (powerful chiefs/kingmakers) shared political authority with the Oba.
Oba Ewedo reduced their influence and made the Oba the sole centre of political power.
This created a centralized monarchy, where succession and major appointments rested more firmly with the royal line.
The introduction of cowries as currency is not linked to Ewedo's reign.
The division of the kingdom into administrative units was not the main feature of his reign.
Trade with the Portuguese began much later, in the fifteenth century.
Therefore, the political development was the establishment of a centralized monarchy.
Answer:A. The establishment of a centralized monarchy