Final answer:
Uthman Dan Fodio, a significant Islamic reformer and teacher, received his primary Islamic education in Kano, which is option D.
Step-by-step explanation:
The main answer to where Uthman Dan Fodio had his primary Islamic education is D) Kano. He was a prominent Islamic scholar, teacher, and the leader of the Sokoto Caliphate. While Timbuktu was indeed a renowned center for Islamic learning, especially during the time of Mansa Musa who greatly encouraged education and scholarship, there's no specific historical record of Dan Fodio’s primary education taking place there. Instead, it was in his homeland in the region of Kano, within the larger context of the Hausa states, where Uthman Dan Fodio received his early education. His later actions and reformist movement would also have extensive influence on the Islamic education system in the region.