What challenge does a government face when regulating price in a natural monopoly? a. There is a net loss in social welfare when a competitive price is imposed on a natural monopoly. b. Setting a price ceiling at the marginal cost of the hast unit sold may cause the seller to incur losses. c. Costs will fall if the price is reduced, allowing the monopolist to maintain high profits. d. Natural monopoly prices are not public, and so the government does not know the current price