It costs $115 to place an order for inventory item Q54 regardless of the order quantity. Item Q54's purchase cost is $29.22, and demand for Q54 is 50 units per month. Holding cost (annual) for Q54 is estimated at 15% of the purchase cost. What is the optimum time between orders for Q54?
A. Not in excess of 2 months
B. In excess of 2 months but not in excess of 3 months
C. In excess of 3 months but not in excess of 4 months
D. In excess of 4 months but not in excess of 5 months
E. In excess of 5 months