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Suppose and archeologist finds a 10th-century gold coin from the Abbasid Caliphate in a Viking grave in Norway, thousands of miles away. For what purpose is the coin most useful as a primary source?
A. Evidence about 10th-century trade networks
B. Information about where Abbasids obtained gold
C. Details about the lives of Viking slaves in Baghdad
D. Calculation of the value of Abbasid money