The Production Planner for a Private Label Soft Drink Maker $\le$

The production planner for a private label soft drink maker is planning the production of two soft drinks: root beer (R) and sassafras soda (S) .There are at most 12 hours per day of production time and 1500 gallons per day of carbonated water available.A case of root beer requires 2 minutes of time and 5 gallons of water to produce,while a case of sassafras soda requires 3 minutes of time and 5 gallons of water.Profits for the root beer are $6.00 per case,and profits for the sassafras soda are $4.00 per case.
-What is the time constraint?

A) 2R + 3S $\le$ 720.
B) 2R + 5S $\le$ 720.
C) 3R + 2S $\le$ 720.
D) 3R + 5S $\le$ 720.
E) 5R + 5S $\le$ 720.