Concept:The Sokoto Caliphate was a centralised state where supreme power belonged to the Caliph and the Emirs.Explanation:The Emir, as the religious and political head, exercised absolute control over the people.There were no elections or representative institutions in the Caliphate.This clearly rules out Democracy and Parliamentary government.Communism is also incorrect, as the state was not organised on communal ownership of property.Concentration of supreme authority in one ruler is exactly Totalitarianism.Answer:C. Totalitarianism