We know very little about the Etruscans, whose civilization flourished in central Italy from the ninth to the second centuries BC, and much of what we do know comes from their art, for the Etruscan language is all but ciphers to us. Greek and Phoenician sources indicate that the Etruscans enjoyed trade and commerce with those societies, by which the Etruscans were doubtless influenced. Yet unlike women in those societies, women in Etruscan society participated in important social functions, as documented by several Etruscan artworks. Thus, the Etruscan women held unusual status and freedom for the time and region.
The argument above requires which of the following assumptions?