Answer:
C. She had to adjust her career plan because her interests changed.
Step-by-step explanation:
At first, Hallie was focused on becoming a Biologist which led to her education stream where all roads will help her achieve her goal of becoming one. The required degrees and educational background were all achieved accordingly so that it will all help her get to be a biologist later.
But when she decided to be a Pediatrician, which is a different course altogether, focusing on children and their health needs, she also needs to change her educational background. She had to get the qualifications needed to understand and be familiar with children and the health specifics. Thus, the decision to go back to school to be a Pediatrician was a result of her the change in her interest. So, she had to adjust her career plan and path due to this career change.