Which of the Following Is True

Multiple Choice

Which of the following is true?
i.Marginal cost is measured by the maximum price that consumers are willing to pay for another unit of a good or service.
ii.Producer surplus equals marginal benefit minus price,summed over the quantity produced.
iii.A supply curve is a marginal cost curve.

A) only iii
B) only i
C) only ii
D) i and ii
E) i and iii