75. An analyst uses a HPLC method to determine a pesticide residue. A 1.00 ppm standard solution of the pesticide produces a peak height (signal) of 40.0 mV. When a blank solution is injected, the standard deviation of the baseline noise is measured to be 0.20 mV. Using the common IUPAC criterion of S/N = 3, what is the Limit of Detection (LOD) for this method (assuming the signal is directly proportional to the analyte concentration)? (A) 0.005 ppm (B) 0.015 ppm (C) 0.045 ppm (D) 0.060 ppm (E) 0.150 ppm