The answer is 4. The shift clarifies and builds upon information in the beginning of the passage.
This option suggests that the shift in organizational pattern causes confusion or interrupts the logical progression of ideas. However, a well-executed shift from a term-and-definition pattern to a chronological pattern can enhance understanding by first defining key concepts and then illustrating their development over time.
This option implies that the shift obscures the evolution of engraving. On the contrary, a chronological pattern is specifically designed to show progression and change over time, making it easier for readers to follow the evolution of a subject.
While a shift in organizational pattern can introduce multiple perspectives, this option suggests a division in focus rather than a cohesive development of ideas. The passage likely uses the chronological pattern to expand on the initial definition, not to present separate main ideas.
This option indicates that the shift enhances understanding by first providing a clear definition and then elaborating on it with historical context. By starting with a term-and-definition pattern, the passage establishes a foundation, and the chronological pattern then builds on this by detailing the evolution of engraving, making the information more comprehensive and accessible.