Concept:Advertising media differ in how they reach an audience.
Some media allow advertisers to target readers who already share a specific interest.
Explanation:Magazines are built around specialised content.
Examples include fashion, sports, business, or technology topics.
This content attracts a particular group of readers by itself.
Because of this, advertisers do not need to sort the audience manually.
The magazine\u2019s theme has already preselected the type of people who will read it.
Newspapers, billboards, and handbills reach a more general public.
Their readership is not filtered by special-interest content in the same way.
Therefore, magazines best match the description in the question.
Answer:A. Magazine