Guidelines for the Jolly Blue Giant Health Insurance Company say that the average hospitalization for a triple hernia operation should not exceed 30 hours. A diligent auditor studied records of 16 randomly chosen triple hernia operations at Hackmore Hospital, and found a mean hospital stay of 40 hours with a standard deviation of 20 hours. "Aha!" she cried, "The average stay exceeds the guideline." The p-value for a right-tail test of her hypothesis is
A. less than .01
B. between .01 and .025
C. between .025 and .05
D. between .05 and .10
