The following table shows the cost of a shirt for each week during a sale. What is the rate of change for this situation?
Week Price
1 $32.50
2 $30.00
3 $27.50
4 $25.00  


A) $7.50 per week

B) -$7.50 per week

C) -$2.50 per week

D) $2.50 per week