Concept:The Hausa pre-colonial political structure divided the kingdom into administrative units headed by appointed officials.Explanation:The Emir or King ruled the central authority and appointed officials to manage different regions.Each district was placed under a Hakimi, who collected taxes and maintained law and order.A dagaci led a smaller village unit, while an alkali was a judge and a waziri was the chief adviser.Therefore, the district head was the Hakimi.Answer:A. A hakimi