Which of the Following Statements Is True About the History

Which of the following statements is true about the history of psychology?

A) There are many clear-cut boundaries that separate old-school psychology from new-school psychology.
B) There is no clear-cut boundary or landmark event to separate old-school psychology from new-school psychology.
C) The clear-cut boundary that separates old-school psychology from new-school psychology is Freud's discovery of psychoanalysis.
D) When behaviorism was created, a clear-cut boundary was established to separate old-school psychology from new-school psychology.