The Social Costs of an Activity Are Greater Than the Private

The social costs of an activity are greater than the private costs of the activity when

A) a person does not pay all costs associated with a particular resource-using activity.
B) the internal costs of the resource-using activity are less than the external costs of the activity.
C) the internal costs of the resource-using activity are positive.
D) the external costs of the resource-using activity are zero.