The General Chemical Company Uses 150,000 Gallons of Hydrochloric Acid

The General Chemical Company uses 150,000 gallons of hydrochloric acid per month. The cost of carrying the chemical in inventory is 50 cents per gallon per year, and the cost of ordering the chemical is $150 per order. The firm uses the chemical at a constant rate throughout the year. It takes 18 days to receive an order once it is placed. The reorder point is

A) 7,500 gallons.
B) 25,000 gallons.
C) 105,000 gallons.
D) 90,000 gallons.