For a given good or service, the marginal social benefit ( MSB and the marginal social cost (MSC) curves are least accurately described by which of the following（）
A. Producer surplus is determined by price and the MSC curve and consumer surplus is determined by price and the MSB curve.
B. The efficient allocation of resources occurs where the difference between the MSB and MSC curves is maximized.
C. The market demand curve is the same as the MSB curve, and the market supply curve is the same as the MSC curve.
