Answer the Question on the Basis of the Following Marginal

Multiple Choice

Answer the question on the basis of the following marginal utility data for products X and Y. Assume that the prices of X and Y are $4 and $2, respectively, and that the consumer's income is $18. If the price of X decreases to $2, then the utility-maximizing combination of the two products is

A) 2 of X and 5 of Y.
B) 4 of X and 6 of Y.
C) 6 of X and 3 of Y.
D) 4 of X and 5 of Y.