What constitutes acceptable linearity in a calibration curve for chromatography?

What constitutes acceptable linearity in a calibration curve for chromatography?

• A. A calibration curve with R^2 ≥ 0.95.
• B. A calibration curve plots detector response versus known concentrations; acceptable linearity is typically R^2 ≥ 0.99 over the calibration range; residuals should be randomly distributed and within limits.
• C. A calibration curve with a slope of zero.
• D. Linearity is irrelevant for quantitative analysis.

Answer: (C)