You are listening to a university lecture about historical trade routes. The lecturer discusses the Silk Road, maritime spice routes, and trans-Saharan salt trade. Which of the following is most likely the main idea of the lecture?
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A
A detailed history of the salt trade in North Africa.
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B
The impact of various ancient trade networks on global interaction.
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C
The types of goods transported along the Silk Road.
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D
A comparison of land-based versus sea-based trade routes.