Orangetree Pharma's Demand for Test Tubes Is 72,000 Units

Orangetree Pharma's demand for test tubes is 72,000 units. If the lead time for placing an order is 5 days, then an order should be placed at an inventory level of: (Assume 360 days in a year)

A) 625 units.
B) 800 units.
C) 1,250 units.
D) 1,000 units.
E) 2,500 units.