If an Activity Produces an External Economy,then There Will Be

If an activity produces an external economy,then there will be too:

A) much of the activity undertaken by private parties from a social viewpoint.
B) little of the activity undertaken by private parties from a social viewpoint.
C) much of the activity undertaken by government from a private viewpoint.
D) much of the activity undertaken by private parties from a private viewpoint.
E) much of the activity undertaken by government from a social viewpoint.