To Derive a Demand Curve for a Public Good,we

To derive a demand curve for a public good,we

A) add the price that each consumer is willing to pay for each quantity of the public good.
B) add the quantities that each consumer is willing to purchase at each price of the public good.
C) multiply the quantity demanded at each price by the number of the consumers.
D) multiply the price by the quantity for each consumer and add up across all consumers.