Figure 7-2 Figure 7-2 Represents the Market for Vaccinations

Figure 7-2 Figure 7-2 represents the market for vaccinations. Vaccinations are considered a benefit to society, and the figure shows both the marginal private benefit and the marginal social benefit from vaccinations.
-Refer to Figure 7-2. At the market equilibrium

A) the marginal cost is equal to the marginal benefit.
B) the marginal cost is greater than the marginal benefit.
C) the marginal cost is less than the marginal benefit.
D) the marginal cost is zero.