The piece of evidence that could be regarded as the BEST support to the central idea of the writer in the paragraph is:
The meaning of the central idea of a writer in a paragraph or a passage shows the most important part of the text and shows how effective the information is communicated to the reader.
The first sentence, tells us how a group of writers took a bold move with a concept called "New Journalism". This was combined with the use of Literary techniques and reportage. Eventually, the bold move turned out wildly from the same long-held notion of objective reporting by the muckrakers.
Therefore, we can conclude that the central idea of the writer shows; "an excerpt from a work of New Journalism that exhibits the characteristics described".
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