Consider the Following All-Units Quantity Discount Schedule and Calculated EOQs

Consider the following all-units quantity discount schedule and calculated EOQs. Units Ordered Price Per Unit EOQ at that Price
0-999 $36.00 1200
1,000-1,999 $32.00 1450
2,000-4,999 $30.00 2500
5,000-8,000 $26.00 2780
≥ 8,000 $20.00 6000
Which of the following sets of order quantities is guaranteed to contain the optimal solution?

A) {1450,2500}
B) {1450,999}
C) {0,1000,2000,5000,8000}
D) {1200,1450,2500,2780,6000}
E) {2500,5000,8000}