The answer is B Marginal cost is the money a producer pays for making one more unit, while marginal revenue is the money a producer earns from selling one more unit.
The option B is true as it gives the real definition of marginal cost and marginal revenue.
Marginal cost is the extra expense a business incurs when producing one additional product or service. While, the Marginal revenue is the incremental increase in revenue that a business experiences after producing one more product or service.
Hence, option B tells the correct definition of marginal cost and marginal revenue.
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