Concept:The most reliable local historical source on the Hausa states is the Kano Chronicle.Explanation:The Kano Chronicle is a native written record that focuses on the history, kings, and traditions of the Hausa states, especially Kano.Tarikh-as-Sudan mainly covers the Western and Central Sudan, not the Hausa states directly.European accounts and Arab traders’ accounts are secondary and mostly describe coastal or external contacts.Therefore, the Kano Chronicle remains the most important internal source for Hausa history.Answer:C. The Kano Chronicle.