The passage connects to the idea of the trip as an annual pilgrimage by highlighting the author's personal attachment to the familiarity and consistency of Grandma Rose's home. The most fitting interpretation is:
• The author explains that she walks the house every year to check that its contents are still the same.
This reflects the idea of pilgrimage as it involves a journey back to a meaningful place that holds sentimental value, emphasizing the importance of routine, memories, and the emotional significance of the setting.