Which of the Following Statements Are Not True

Which of the following statements are not true?

A) The sign test assumes the data are interval instead of ordinal.
B) The sign test makes less efficient use of the data than does the Wilcoxon signed rank test.
C) In the sign test,each observation (one-sample test) or difference between paired observations (paired samples) is expressed only as a plus (+) or a minus (-) to indicate the direction of the difference.
D) All of these statements are true.
E) None of these statements is true.