Final answer:
The question that would best help narrow the topic on newspapers is 'What were the technological advancements in newspaper production between 1830 and 1860?'
Step-by-step explanation:
Narrowing a topic in newspapers involves refining the subject matter to focus on specific aspects, issues, or themes within the broader context of news reporting. This process ensures a more targeted and in-depth exploration of a particular aspect of newspaper content.
When narrowing the topic to newspapers, it is important to ask specific questions to focus the research. One question that can help narrow the topic is 'What were the technological advancements in newspaper production between 1830 and 1860?' By exploring this question, John can investigate how machines and manufacturing made newspaper production faster and less expensive during that time period.