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Question 80·Medium·Inferences

For decades, archaeologists classified a group of ninth-century ceramic jars found at the port of Selka as products of a local workshop because the jars’ painted wave motifs resemble those in nearby murals. Recent analysis, however, found that the jars’ clay has the mineral signature of deposits located far inland. At an inland kiln site, researchers also discovered discarded unpainted jars that match the Selka jars in shape and firing marks. Meanwhile, the Selka jars’ blue pigment contains a compound found in paint-mixing bowls near the port but not among materials at the inland kiln. Records confirm that goods traveled regularly between the two locations.

Which choice best states an inference supported by the text?