Scenario 4.1: Daniel Derives Utility from Only Two Goods, Cake (Qc) and (Qc)

Multiple Choice

Scenario 4.1:
Daniel derives utility from only two goods, cake (Qc) and donuts (Qd) . The marginal utility that Daniel receives from cake (MUc) and donuts (MUd) are given as follows:
MUc = Qd MUd = Qc
Daniel has an income of $240 and the price of cake (Pc) and donuts (Pd) are both $3.
-See Scenario 4.1. Holding Daniel's income and Pd constant at $240 and $3 respectively, what is Daniel's demand curve for cake?

A) Qc = 240 - Pc
B) Qc = 240/Pc
C) Qc = 120/Pc
D) Qc = 240/(3 + Pc)
E) none of the above