B, Had a complex society with separate settlements and different rulers.
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An APHugist!
But, no, on your list it would be an anthropologist
A primary source is someone who was there at the time the event happioned or an artifact from that time line
secendairy source (sry 4 my bad spelling) is something from after the event or writen from after the event
That would be
C. juries
Because before juries the King would have the final decision on who was guilty and who was not