A bottling company produces bottles that hold 12 ounces of liquid. Periodically, the company gets complaints that their bottles are not holding enough liquid. To test this claim, the bottling company randomly samples 250 bottles and finds the average amount of liquid held by the bottles is 11.7 ounces with a population standard deviation of 0.4 ounce. Calculate the appropriate test statistic.
A) z = -18.750
B) z = -3.674
C) z = -11.86
D) z = -2.372