The correct answer is discontinuous change.
Due to Rachael's skiing incident, it affected her thinking, not in a good nor bad way but neutrally. It made her think more of the possible events that may occur if she continued to be outgoing, which is why she decided to be more thoughtful and be reserved. Not all psychologists, in any case, concur that advancement is a nonstop procedure. Some view development as an irregular procedure. They trust development includes unmistakable and isolate stages with various types of process happening in each stage.