What is a supporting detail in writing?

A supporting detail in writing serves to reinforce or substantiate the main idea presented in a text. It provides additional context, evidence, or examples that clarify and strengthen the primary argument or claim the author is making. This could take the form of facts, statistics, quotes, or anecdotes that illustrate the broader point. By including these supporting details, a writer can effectively persuade the audience, making the main idea more credible and compelling.

In contrast, personal opinions, concluding statements, or rhetorical questions do not fulfill the role of supporting details, as they either express subjective views, summarize points without elaboration, or prompt reflection without providing evidence. Thus, the choice that defines a supporting detail accurately reflects its purpose in writing.