Which of the following describes the role of supporting details?

• A. They are facts, examples, and data that explain or prove the main idea
• B. They are unrelated anecdotes
• C. They are the author’s favorite quotes
• D. They are the article's title

Answer: (A)

Supporting details are the facts, examples, and data that explain or prove the main idea. They give concrete evidence, clarify what the author is arguing, and help readers see why the point matters. These details can be statistics, specific instances, definitions, or quotes from experts that directly support the claim. Without them, the main idea can feel vague or unpersuasive. For instance, if the main idea is that regular exercise improves health, the supporting details might include data on reduced heart disease risk, a personal story of increased energy after starting a routine, and a clear explanation of what counts as moderate activity.