The Figure Below Shows the Marginal Benefit to Consumers,MB,the Marginal

The figure below shows the marginal benefit to consumers,MB,the marginal cost to private firms,MC_P,and the marginal cost to society,MC_S,at each level of output of some good. FIGURE 17-1
-Refer to Figure 17-1.The equilibrium output that would occur in a competitive market in the absence of government intervention is

A) zero.
B) Q₁.
C) Q₂.
D) Q₃.
E) none of the above; there is no equilibrium output level.