Which of the Following Correctly Describes the Deadweight Loss Associated

Which of the following correctly describes the deadweight loss associated with any positive externality?

A) the cost borne by third parties if the externality is not internalized
B) the benefit to third parties of keeping the externality in place
C) the cost to consumers of government actions to internalize the externality
D) the cost to producers of government actions to internalize the externality
E) the combined cost,to consumers and producers,of government actions to internalize the externality