The point that one's response would include is option A. New evidence may overturn existing theories. Researchers might find new sites with human artifacts, thus providing new evidence.
Once researchers find human artifacts in new places, such a finding would likely change archeological theories.
Archaeologists study beyond human activity by findings and interpreting objects and locations of historical interest. Archaeologists use excavation techniques also called digs, protect archaelogical remains and gather data that add to their understanding of the past.
Therefore, the correct answer is as given above
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