The average amount of chlorine needed for a swimming pool is 3.6 milligrams of chlorine for every gallon of water. Which equation can be used to determine c, the number of milligrams of
chlorine needed for a swimming pool containing g gallons of water?

A. g = 3.6/c

B. g = 3.6c

C. c = g/3.6

D. c = 3.6g