The efficient output occurs at:
A.	2,500 gallons.
B.	5,000 gallons.
C.	1,000 gallons.
D.	1,750 gallons.
Answer:D
The efficient output occurs at:
A.	2,500 gallons. B.	5,000 gallons. C.	1,000 gallons. D.	1,750 gallons.