Final answer:
As per Anna Freud, a well-adjusted happy adolescent like Jason likely has a well-developed ego that balances the desires of the id with the moral pressures of the superego, implying he has resolved the Oedipus complex.
Step-by-step explanation:
According to Anna Freud, if Jason is a well-adjusted happy adolescent, it suggests that he has a well-developed ego. The ego is responsible for balancing the desires of the id, with the moral and social pressures of the superego. Considering Freud's theory of psychosexual development, particularly the phallic stage, successful resolution of the Oedipus complex leads to the development of a strong superego. Thus, a well-adjusted adolescent, per Freudian theory, would have not only resolved the Oedipus complex but also developed a well-balanced personality where the ego effectively mediates between the conflicting demands of the id and the superego.