The Following Figure Shows the Average Cost [AC],marginal Cost [MC],and

The following figure shows the average cost [AC],marginal cost [MC],and demand [D] curves for a natural monopoly;Qi denotes quantity and Pi denotes price.
Figure 15-3
-In Figure 15-3,under marginal-cost pricing,the monopoly would earn:

A) negative economic profit equal to P₃CBP₂.
B) positive economic profit equal to P₂BQ₂O.
C) negative economic profit equal to FBQ₂Q₁.
D) positive economic profit equal to FCQ₂Q₁.