Final answer:
According to Carl Jung, introversion and extraversion are fluid traits that reflect individual orientations towards social interaction and internal psychic activity, with a balance between the two leading to self-realization.
Step-by-step explanation:
The question you're asking relates to Carl Jung's beliefs on introversion and extraversion. Jung believed that introversion and extraversion are two attitudinal orientations or approaches toward life that could vary from one person to another. People who are extroverts tend to be socially oriented and gain energy from being around others, while introverts may either be quiet and reserved or social, but they derive their energy from internal psychic activity. Moreover, Jung believed these traits are not fixed; rather, a balance between the two best serves the goal of self-realization, suggesting that they are fluid traits. Therefore, the correct answer to the question is (c) They are fluid traits.