Refer to the Following

Multiple Choice

refer to the following:
The manager of the Quick Stop Corner Convenience Store (which never closes) sells four cases of beer each day. Ordering costs are $8 per order, and beer costs $0.80 per six-pack (each case of beer contains four six-packs) . Orders arrive three days from the time they are placed. Daily holding costs are equal to 5% of the cost of the beer.
-At what point should the manager reorder?

A) 0 cases remaining
B) 4 cases remaining
C) 12 cases remaining
D) 16 cases remaining
E) 20 cases remaining