题目能看懂，但是选项BCE都好绕，看不大懂啊，请NN帮助解释下选项的意思：
Excavations of the Roman city of Sepphoris have uncovered发现 numerous detailed 详细的，复杂的mosaics 马赛克depicting several readily identifiable
animal species: a hare, a partridge, and various Mediterranean fish. Oddly, most of the species represented did not live in the Sepphoris region when these mosaics were created. Since identical motifs主题 appear in mosaics found in other Roman cities, however, the mosaics of Sepphoris were very likely created by traveling artisans from some other part of the Roman Empire.
Which of the following is an assumption on which the argument depends?
A. The Sepphoris mosaics are not composed exclusively 专门的，独有的of types of stones found naturally in the Sepphoris area.S地方的马赛克不是S地区独有的石头种类，无关。
B. There is no single region to which all the species depicted in the Sepphoris mosaics are native.
C. No motifs appear in the Sepphoris mosaics that do not also appear in the mosaics of some other Roman city.
D. All of the animal figures in the Sepphoris mosaics are readily identifiable as representations of known species.
E. There was not a common repertory of mosaic designs with which artisans who lived in various parts of the Roman Empire were familiar.
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