Final answer:
Ricardo's experience suggests he is in the tentative stage of Ginzberg's career development theory during his college years, where he is refining his career preferences.
Step-by-step explanation:
Ricardo is likely in the tentative period of Ginzberg's stages of career choice. The tentative stage typically occurs during adolescence and into college years, where individuals start to think more seriously about their future career paths. They may explore different roles through classes, majors, and work experiences, such as internships. In Ricardo's case, the internship experience at an investment firm has allowed him to feel more confident about his decision, suggesting that he is refining his preferences and moving towards a more defined career choice.