In the market for antibiotics, why is it suboptimal to produce at the market equilibrium quantity (QMarket)? Select one: a. At QMarket, the social cost is greater than the private value b. At QMarket, the social cost is less than the private value c. At QMarket, the social cost is equal to the private value d. At QMarket, the private cost is greater than the private value e. At QMarket, the private cost is less than the private value