Suppose Dianne Lindsay Spends All Her Income on Two Goods

Suppose Dianne Lindsay spends all her income on two goods, A and B, in a manner in which MU_a = 15 and MU_b = 75, and P_a = $3 and P_b = $15, then she

A) is already maximizing her total utility and should make no change
B) should increase her purchases of B and decrease her purchases of A because MU_b is higher than MU_a
C) should raise MU_a so that the MU_a/P_a ratio is higher and therefore buy more of A and less of B
D) should raise MU_a so that the MU_a/P_a ratio is higher and therefore buy more of B and less of A
E) should increase her purchases of A and decrease her purchases of B because the price of A is lower