D
Ancient humans in eastern North America hunted mammoths until the mammoth disappeared from the area around 13, 000 years ago. Recently, a fossil bone with an engraving that depicts a mammoth was found in an ancient settlement in eastern North America. This shows that the settlement was occupied at a time when mammoths lived in this area. The argument requires the assumption that
A: the fossil on which the engraving was made was not a mammoth bone
B: when mammoths disappeared from eastern North America, there were no mammoths left anywhere in North America
C: there is no scientific way of dating when the engraving of the mammoth was made
D: the engraving was made during the time when the settlement was occupied