Which of the Following Statements Is an Accurate Criticism of Kübler-Ross

Which of the following statements is an accurate criticism of Kübler-Ross' theory of dying?

A) She underestimated the amount of time that people remain in the anger stage.
B) She did not consider that men and women go through each stage differently.
C) Neither she nor independent research have demonstrated that the five stages actually exist.
D) She ignored the notion that most people do not even realize that they are dying.