Which statement best contrasts a systematic review with a narrative review?

Which statement best contrasts a systematic review with a narrative review?

• A. Systematic reviews use predefined methods to identify, appraise, and synthesize evidence; narrative reviews are descriptive without explicit methods
• B. Systematic reviews are always qualitative; narrative reviews are always quantitative
• C. Systematic reviews rely on expert opinion; narrative reviews rely on randomized trials
• D. Systematic reviews ignore study quality; narrative reviews emphasize quality appraisal

Answer: (A)