Identify a weakness in a persuasive argument and suggest an improvement.

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The key idea is that persuasive strength hinges on evidence. When a claim lacks enough credible data or warrants, the argument leaves readers with doubt about why the claim should be accepted. Strengthen it by adding credible data, studies, statistics, or expert testimony and by clearly connecting that evidence to the claim through warrants, so readers can see exactly why the data supports the conclusion. For example, if the claim is that regular exercise improves health, including studies that show reduced risk of disease and explaining how those findings apply to the claim makes the argument much more convincing. The other options describe strengths or less direct fixes; careful statistical analysis is a strength, addressing counterarguments is a strength, and narrowing a broad claim is helpful but not as directly corrective as adding solid evidence.