Consumer surplus is most accurately define

问题：

Consumer surplus is most accurately defined as the difference between the:（）

A. total value consumers place on the quantity of a good purchased, and the total amount they must pay for that quantity.

B. value consumers are willing to pay for an additional unit of good or service and the cost of producing the additional unit of the good or service.

C. marginal benefit and the marginal cost of the last unit consumed of a good or service.