According to Freud's theory, the developmental periods that leave their mark on adult personality are

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Freud's theory states that personality is developed through a series of psychosexual stages in which individuals must resolve conflicts related to their innate biological drives. Fixations can occur if someone becomes overly fixated on a particular stage, which can lead to personality traits and behaviors that are associated with that stage. Therefore, choice D, psychosexual stages, is the correct answer.

According to Freud's Theory, the Developmental Periods That Leave Their