Final answer:
A sociologist might classify an abstract as structured due to its organized format, including distinct sections such as background, purpose, methods, results, and conclusions, which makes the research easily comprehensible and comparable.
Step-by-step explanation:
A sociologist would classify a document as a structured abstract because it follows a specific organization and format. Structured abstracts are commonly used in academic and professional fields to provide a clear, concise summary of a larger work, such as a research paper, dissertation, or article. These abstracts typically include distinct sections such as background, purpose, methods, results, and conclusions, allowing the reader to quickly grasp the essential elements of the research. The use of a structured format facilitates easier understanding and comparison of different studies within a field.