Freud's Idea That Fixation at the Anal Stage Leads to a Stubborn

Freud's idea that fixation at the anal stage leads to a stubborn and regulating personality is

A) more likely to occur if they also became fixated at the oral stage.
B) currently incorporated into modern personality theory.
C) unsupported by current research in personality theory.
D) the basis of Freud's psychosexual development theory.