We Determine the Economy's Marginal Benefit Curve for a Public

We determine the economy's marginal benefit curve for a public good or service by

A) dividing the sum of the marginal benefit of each member of society by the number of people in society.
B) horizontally summing the individual marginal benefit curve of each member of society.
C) multiplying the marginal benefits of each member of society.
D) vertically summing the individual marginal benefit curve of each member of society.
E) vertically summing individual firms' marginal cost curves.