Which of the following is the best description of when to use standard addition? A. Standard addition should be used when sample matrix in the measurement solution alters the analyte response when compared to analyte dissolved in pure solvent. B. Standard addition should be used when metal concentration in a sample is being determined. C. Standard addition should be used when a blank control cannot be produced as part of the calibration curve. D. Standard addition should be used when soil samples are being determined. E. Standard addition should be used when interferences in metal analyses alters the value of the response.