Figure 11-8 Figure 11-8 Shows the Market for Measles

Figure 11-8 Figure 11-8 shows the market for measles vaccinations, a product whose use generates positive externalities.
-Refer to Figure 11-8.Why is there a deadweight loss?

A) Because the marginal private benefit for each additional unit between Q₁ and Q₂ exceeds the marginal cost.
B) Because the marginal private cost for each additional unit between Q₁ and Q₂ exceeds the marginal private benefit.
C) Because the marginal social cost for each additional unit between Q₁ and Q₂ exceeds the marginal social benefit.
D) Because the marginal social benefit for each additional unit between Q₁ and Q₂ exceeds the marginal cost.