In the graph above, which area represents the size of the externality?

Name: In the graph above, which area represents the size of the externality?
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Since the private equilibrium occurs at $10 and 12 units, the socially optimal equilibrium occurs when there is a deadweight loss associated with the externality that occurs between quantities 8 and 12. The size of the externality is determined by the difference in marginal benefits (represented by the demand) and the marginal social costs (MSC).

In the Graph Above, Which Area Represents the Size of the Externality