Final answer:
The author develops central ideas by building the text around evidence in the form of supporting details.
Step-by-step explanation:
The author of a text develops central ideas by building the text around evidence in the form of supporting details. Each paragraph in the text should have a topic sentence that states the central idea of the paragraph.
The author then supports this central idea with evidence, such as examples, quotations, and summaries from sources.
The author also synthesizes the evidence by showing the connections between sources and reinforcing the main point of the paragraph.