According to the Following Graphs,what Does the Curve in the Lower

Multiple Choice

According to the following graphs,what does the curve in the lower graph show? The price of Y is $15 per unit.

A) how a consumer's utility-maximizing choices of X and Y change when the budget constraint changes
B) how a consumer's preferences change when income changes
C) how a consumer's utility-maximizing choices of X changes when the price of X changes
D) how a consumer's utility-maximizing choices of Y changes when the price of Y changes
E) both c and d