What was found at Igbo Ukwu?
a.
evidence for copper alloy or bronze casting in Sub Saharan Africa.
b.
thousands of figures which were polished, covered with a red clay slip, and fired at low temperatures.
c.
Examples of textiles which employed a special technique that resembles velour to the touch.
d.
crosses, crucifixes, and other Christian emblems had been created as early as the late fifteenth century.