Which element most directly reinforces the central idea in a nonfiction passage?

• A. A key detail such as facts or examples.
• B. The author’s name.
• C. The font size in headings.
• D. The publication date.

Answer: (A)

The central idea in nonfiction is strongestly reinforced by key details—facts or examples—that provide concrete evidence supporting the main point. When a text includes specific data, statistics, anecdotes, or illustrations that tie directly to the main claim, those details help readers see why the idea matters and understand it more clearly. In this item, such a detail functions as the best reinforcement because it offers tangible material the author uses to back up the argument or explanation.

The author’s name might signal credibility, but it doesn’t embed support for the central idea within the text itself. The font size in headings is a visual design choice and doesn’t contribute to the argument’s evidence. The publication date gives context about when the piece was written, but it doesn’t directly strengthen the central idea with supporting details.