A jug has a maximum capacity of 16 liters. It's filled to 45% of its capacity, and then poured out at a rate of 60 ml/s. Which of the following expressions models the volume remaining in the jug, in liters, after 'seconds?
a. 7.2 - 0.06x
b. 16 - 0.06x
c. 7200 - 60x
d. 16000 - 60x