-If the Price of a Is $3 and the Price

-If the price of A is $3 and the price of B is $5, then, in a consumer optimum

A) the quantity purchased of B must be 60 percent of the quantity of A purchased.
B) the quantity purchased of B must be 67 percent of the quantity of A purchased.
C) the marginal utility of B must be 67 percent more than the marginal utility of A.
D) the marginal utility of A must equal 3 and the marginal utility of B must equal 5.