Answer:
c. Igbo Ukwu
Step-by-step explanation:
Igbo-Ukwu is a city located in the state of Anambra. It is an important archaeological site, as it was a civilization that developed in eastern Nigeria between the 9th and 10th centuries. It is characterized by its work in copper (from the Aïr Mountains) and bronze. Discovered accidentally in 1938 by a resident who was digging a well, it cannot be linked to any other culture in the region, but it reveals the existence of a powerful and refined kingdom.