Ford Motor Company announces that it will offer $3,000 rebates on new Mustangs starting next month. As a result of this information, today's demand curve for Mustangs
a. shifts to the right.
b. shifts to the left.
c. shifts either to the right or to the left, but we cannot determine the direction of the shift from the given information.
d. will not shift; rather, the demand curve for Mustangs will shift to the right next month.