The Brass Sculptures of the Yoruba-Speaking Peoples of the Fourteenth

The brass sculptures of the Yoruba-speaking peoples of the fourteenth century suggest which of the following?

A) The sculptures originated in North Africa, indicating the extent of the trans-Saharan trade network.
B) The copper needed for the sculptures came from the south-central Sahara, an illustration of the far reach of the trans-Saharan trade route.
C) The sculptures are evidence that the people of this region had direct contact with Europeans who made similar ornaments.
D) The sculptures suggest that the peoples of this region were relatively poor and could not afford more expensive metals for their ornamental works.