Passage:

The essay opens by describing a coastal town that once depended entirely on fishing. It then shifts to a discussion of tourism, noting how guesthouses replaced storage sheds along the shore. In its final section, the essay reflects on the town's identity, arguing that although the economy has changed, residents still define themselves by the sea rather than by visitors. The writer does not propose solutions or predict the future, instead ending with a moment of observation at dawn on the harbor.

Which description best captures the overall structure of the passage?