John Jenkins, CFA, is performing a study on the behavior of the mean P/E ratio for a sample of small-cap companies. Which of the following statements is TRUE（）
A. One minus the confidence level of the test represents the probability of making a Type Ⅱ error.
B. A Type I error represents the failure to reject the null hypothesis when it is, in truth, false.
C. The significance level of the test represents the probability of making a Type I error.
