Student Herky lives in Elk Groves and finds that the mean + standard deviation of Mg concentration in tap water from the

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Student Herky lives in Elk Groves and finds that the mean +
standard deviation of Mg concentration in tap water from the past
student locations nearest his home are 7.1 + 1.9 ppm. His
calibration standards range from 0.1 to 1.0 ppm. Which dilution is
most likely to be successful in analyzing his tap water for Mg?
a) 10 mL diluted to 100 mL
b) 5 mL diluted to 25 mL
c) 5 mL diluted to 250 mL
d) 25 mL diluted to 100 mL
e) None of These