The Marginal Social Benefit Curve for a Public Good Is

The marginal social benefit curve for a public good is derived by

A) adding the marginal benefits of all individuals at each quantity.
B) adding the quantities demanded by all individuals at each price.
C) surveying consumers and asking how much they use a certain good or service.
D) adding the total benefits for all consumers for a given quantity of the good.
E) finding the maximum amount someone is willing to pay for one more unit of the good.