For a Public Good, the Marginal Social Benefit

For a public good, the marginal social benefit:

A) equals the sum of the individual marginal benefits for all of the consumers of that unit.
B) equals the sum of each consumer's willingness to pay for that unit.
C) is greater than any individual marginal benefit.
D) equals the sum of the individual marginal benefits of all consumers of that unit, or the sum of each consumer's willingness to pay for that unit, and it is greater than any individual marginal benefit.