Producer surplus is A. the difference between the lowest price a firm would be willing to accept and the price it actually receives. B. the difference between the highest price a consumer is willing to pay and the price the consumer actually pays. C. the difference between the lowest price a firm would be willing to accept and marginal cost. D. the market price multiplied by the number of units sold by a firm. E. the difference between the highest price a consumer is willing to pay and the lowest price a firm would be willing to accept.