A passage about medieval trade routes states: "The Silk Road was not merely a commercial conduit but a cultural artery through which ideas, religions, and technologies flowed between East and West." The metaphor "cultural artery" compares the Silk Road to:
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A
A military supply line
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B
A vital channel for circulation, like a blood vessel carrying essential elements
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C
A physical road made of silk fabric
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D
A diplomatic treaty between civilizations