The answer is letter c, specialization increase the demand for product. It is because specialization focuses more on the products that are being produced in which they provide greater quality for the consumers in which promotes its product efficiency.
Had the most productive economy in the world.
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<u>B. The spread of Islam throughout West Africa.</u>
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I hope this helps! /~\
The answer is C. Barter economy. Barter is a trading system of exchange.
