Concept:The Old Oyo Empire was a monarchy with a supreme political head whose authority was guided by traditional councils.Explanation:The Old Oyo Empire practiced a monarchical system of government.Its ruler was known as the Alaafin.The Alaafin was the political head and supreme king of the empire.His rule was not dictatorial because he governed with the advice of the Oyomesi council.He was not bound to accept every piece of advice given to him.Thus, the political head of the empire was the Alaafin.Answer:D. Alaafin