Final answer:
When Ford Motor Company announces $3,000 rebates on new Mustangs, the demand curve for Mustangs will shift to the right.
Step-by-step explanation:
The correct answer is 1) Shift to the right. When Ford Motor Company announces $3,000 rebates on new Mustangs, it means that the price of Mustangs will decrease. This lower price will cause an increase in the quantity demanded, resulting in a shift of the demand curve to the right. This shift indicates an increase in demand for Mustangs.