Under which of the following monopoly pricing methods is the average price paid by a consumer equal to the marginal willingness to pay by that consumer:

A. First degree price discrimination
B. Second degree price discrimination
C. Third degree price discrimination
D. Both (a) and (b)
E. Both (b) and (c)
F. Both (a) and (c)
G. All of the above
H. None of the above

Answer: C