The answer is an al stage. Thus, according to Freud's theory of psychosexual development, Jake is most likely to have experienced fixation during the an al stage.
Five psychosexual stages—the oral, an al, phallic, latency, and genital stages—are when Freud suggested that a child's personality develops. Each stage of sexual development involves a distinct way for the body's libido (sexual energy) to manifest itself.
During the an al stage the youngster is now fully cognizant of the fact that they are individuals in their own right and that their desires may conflict with those of the outside world.
Learn more about Freud's theory of psychosexual development here:
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