Answer:
B) the additional positive value that a person receives from consuming one more unit of a good or service
Explanation:
A benefit is an advantage or gains to someone. In economics, the term marginal refers to an extra unit or one more unit.
Marginal benefit is the additional gain associated with consuming one more unit of a product or service. In this context, the term marginal benefit is used interchangeably with marginal utility. In practice consuming the first unit provides the highest benefit. Continuous consumption result in reduced benefits. In other words, marginal benefits decline with additional consumption.