Excavations of the Roman city of Sepphoris have uncovered numerous detailedmosaics depicting several readily identifiable animal species:  a hare, a partridge, and variousMediterranean fish.  Oddly, most of thespecies represented did not live in the Sepphoris region when these mosaicswere created.  Since identical motifsappear in mosaics found in other Roman cities, however, the mosaics ofSepphoris were very likely created by traveling artisans from some other partof the Roman Empire.

Which of the following is an assumption on which theargument depends?

A.     The Sepphoris mosaics are not composedexclusively of types of stones found naturally in the Sepphoris area.

B.      There is no single region to which all thespecies depicted in the Sepphoris mosaics are native.

C.      No motifs appear in the Sepphoris mosaicsthat do not also appear in the mosaics of some other Roman city.

D.     All of the animal figures in the Sepphorismosaics are readily identifiable as representations of known species.

E.      There was not a common repertory of mosaicdesigns with which artisans who lived in various parts of the Roman Empire were familiar.