Refer to the Diagrams, Which Show Identical Marginal Utility from Income

Refer to the diagrams, which show identical marginal utility from income curves for Singer and Catalano. If a given income of $20,000 is initially distributed so that Singer receives $15,000 and Catalano $5,000, the marginal utility

A) of the last dollar of income will be greater for Catalano than for Singer.
B) derived from the last dollar will not be comparable between the two income receivers.
C) of the last dollar of income will be the same for both Singer and Catalano.
D) of the last dollar of income will be greater for Singer than for Catalano.