What does the author imply about Rex in relation to the family's experience?

The correct answer indicates that Rex serves as a new pet in the family context, which suggests that he requires attention and care, such as being taken outside. This implies that the family is adapting to the responsibilities that come with having a pet, which is part of their overall experience. The mention of a "new" pet implies a recent addition to their dynamics, likely leading to different interactions and activities within the family. This new responsibility may also affect their family outings or experiences if they need to consider Rex's needs while navigating other challenges, such as exploring a dark or unfamiliar environment.

Other options present scenarios that do not align with the implications about Rex as a pet. For instance, the idea of getting lost does not tie back to Rex but rather focuses on the challenges of navigation. Similarly, Jamie's navigation skills or the status of their backpacks are unrelated to Rex's role in the family's experience, as they pertain to other concerns or situational elements.