. You are analyzing the results of a study comparing the 5-year incidence of a disease between subjects randomized to Drug A or a placebo. In addition to estimating sample time-to-disease curves via the Kaplan-Meier method !# $%&' )() # 0123456() 7, you also plan to use a log-rank test compute a p-value. The corresponding null and alternative hypotheses are as follows: Ho: $%&' )() = 0123456() HA: $%&' )() 0123456() Under what assumption is the p-value computed, and interpreted?

a. The assumption that the p-value will be less than 0.05.

b. The assumption that the result will not be statistically significant.

c. The assumption that $%&' )() = 0123456()

d. The assumption that $%&' )() 0123456()