Which of the following does not seem like a way to narrow your topic? Choosing a particular population to focus on Choosing a particular area of the world to focus on Choosing a particular subject like "healthcare' to focus on Choosing a particular time period to focus on​

Choosing a particular subject like "healthcare' to focus on

Explanation:

There are various ways to narrow the scope of a research topic such as choosing a particular population, time period, location in the world and causes and the like. This will enable the research to be easier to do and cheaper as well.

Choosing a particular subject will not necessarily narrow a topic because the topic is most likely under a subject as well. Basing it again on a subject would broaden the scope as subjects are general in nature.

the underlined phrase is an example of : understatment