I believe it was C) the reformation!
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Answer:
i think the answer the is a and c i dont know
Explanation:
The Black death originated in the Sicilian port of Messina.
Externality An economic side effect of a good or service that generates benefits or costs to someone other than the person deciding how much to produce or consume. When the production or consumption of a good or service has an effect upon a third party. Failure of the market to achieve a social optimum where MSB = MSC
The answer is a)produce or consume