Final answer:
The focus of the passage shifts from an overview of industrial advancement to a clarification of the problem, which is indicative of a common rhetorical strategy to deepen understanding of a topic.
Step-by-step explanation:
The question pertains to the structure of a written passage, which involves a shift in its main focus. Initially, the passage starts with an overview of industrial advancement, outlining the development and impacts of industrialization. Over time, the focus shifts to more specific issues by providing a clarification of the problem that industrial advancement might have caused or encountered. This change from a broad discussion of industrialism and its evolution to a targeted analysis of the problems related to it is a common rhetorical strategy used to engage readers and present a more comprehensive understanding of the topic.
In the context of educational materials, such shifts help students to not only understand the background and progression of industrialization but also to recognize specific challenges and consider possible solutions. By describing the benefits of living in a city during the industrial revolution and the problems of city life alongside, for example, students are encouraged to think critically about the consequences of technological and societal changes.