Final answer:
Ji-Suk's actions that develop the theme of generational distinctness are her quitting her career to open a food truck, which represents a shift from traditional norms, and not forcing her son to learn Korean, allowing him to shape his own identity.
Step-by-step explanation:
The question asks which action of Ji-Suk's develops the theme of each generation trying to be distinct. The action that most clearly supports this theme is Ji-Suk quitting her career as a lawyer to open a food truck. This decision represents a clear break from traditional expectations and illustrates a desire to forge a unique path that differentiates her from previous generations. Additionally, not forcing her son to learn Korean might also support this theme, as it shows a shift from holding onto traditional cultural expectations to allowing the next generation to shape their own identity. However, learning to speak Korean and taking violin lessons might not be as directly related to the theme of generational distinctness as these actions could be seen as embracing tradition rather than seeking distinction.