Answer:
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The Romans adopted the Greek's use of realistic features when making human art. Both Greek and Roman human art could be very unforgiving, meaning that every blemish on a human's face was included in a Roman sculpture or painting.
It was unbelievable, I was drowning.
The Mound Builders used metal tools, and were probably metal builders. Based on that information I would say the answer is B.Copper, because copper is a metal.