< Question 39 of 50 > This test: 100 poin This question: 2 p Under an average - cost pricing policy: O A. a regulatory agency picks a price at which a natural monopoly's demand curve intersects its average cost curve. O B. a regulatory agency picks a price equal to a natural monopoly's average fixed cost. O c. a regulatory agency picks a price equal to a natural monopoly's marginal cost. O D. firms earn economic profits greater than zero