To Find the Economy's Marginal Benefit Curve of a Public

To find the economy's marginal benefit curve of a public good, we

A) sum the prices consumers are willing to pay for different quantities of the good.
B) sum the costs of the inputs used to produce the good.
C) sum the quantities demanded at each individual price.
D) sum the marginal benefits of each individual at each quantity.
E) average the prices consumers are willing to pay for the same quantity of the good.