The trade across the Sahara Desert between the Arab merchants and West African Kingdoms was primarily based on an exchange of—

Salt and Gold

Explanation:

This was often referred to as the GOLD-SALT trade. The West African kingdoms have an abundance of golds.

This is evident in Ghana till the present moment and Mali during the time of Mansa Musa in the 14th century.

On the other hand, the Arab merchants have abundant salt for trading due to their nearness to the sea.

Hence, the right answer, in this case, is the trade was primarily based on SALT and GOLD.

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the correct answer is “opportunity cost”. opportunity cost is what a company misses out because it decided in one option over another one. in this case, the company decided to invest in building a factory so it gave up another possible benefit or profit in order to achieve success with the factory.  

trade-off is not the correct answer since it is a situation in which you accept losing something in return for benefits in other areas.

and finally, consequence is a general term used to accept what it comes when you make a decision. it can be a positive or negative consequence depending if the decision you took was the correct one.