Answer:
С). the additional effort and resources needed to produce one additional unit of a good or service
Explanation:
Marginal cost is the extra expenses associated with the production or sale of one more unit of output. Marginal cost is compared and contrasted with marginal revenue to determine if production should continue or not.
Both marginal cost and marginal revenue are concepts of marginal analysis. They are decision-making tools in the production process. for a profit-maximizing firm, production should continue for as long as marginal revenue is greater than marginal cost.