Which of the Following Statements Are Not True

Which of the following statements are not true?

A) When at least one of the sample sizes in a two-sample problem is small, the t test requires the assumption of normality (at least approximately) .
B) The Wilcoxon rank-sum test statistic W is the sum of the ranks in the combined (X, Y) sample associated with X observations.
C) Because the Wilcoxon rank-sum test statistic W has a continuous probability distribution, there will always be a critical value corresponding exactly to one of the usual levels of significance.
D) All of the above statements are true.
E) None of the above statements are true.