Marginal utility is the change in utility that results from increasing the amount of a good consumed by one unit. (option b)
Utility is the total satisfaction a consumer dervies from consuming a good or service. Marginal utility is the additional satisfaction received from consuming an additional unit of a good or service. Marginal utility is the additional utility derived from consuming one more unit of a good.
Economic theory postulates that utility is maximised at the point where marginal utility is equal to the price of the good. The consumption decision is to consume more units of a good that gives the higher utility per good.
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