This was Pablo Picasso and it was created in 1904
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.
Explanation:
you can look them up if they have asked a question
so you go to question and but his account name and you'll find them but if they didn't ask any questions then you can't find them
Vitaphone, as this system was now called, was publicly introduced on August 6, 1926, with the premiere of the nearly three-hour-long Don Juan; the first feature-length movie to employ a synchronized sound system of any type throughout, its soundtrack contained a musical score and added sound effects, but no recorded