This civilization's relics were first discovered not far from the present-day town of Nok. Terracotta and ironwork are hallmarks of Nok culture. Archaeologist Bernard was introduced to the Nok tribe by a tourist in 1943. Clay figures, humans, and animals are all here. There are no sculptured eyes that are round or triangular. Human beings' hairstyles may be rather ornate. When you see a human, you'll often see him or her seated, knees bent.
Attached image: Brass figure of a ruler (Ori Olokun), 1300–1450, brass, made in Ife, 35 cm high
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Diseases introduced by the Columbian Exchange caused a sharp decline in population levels in the Americas beginning in the 15th century. The correct option among all the options given in the question is option "C". The natives never faced the diseases that attacked them and so they did not have any cure for them. <span />