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Nadia wants to create a confidence interval to estimate the mean driving range for her company's new electric vehicle. She wants the margin of error to be no more than 10 kilometers at a $90 \%$ level of confidence. A pilot study suggests that the driving ranges for this type of vehicle have a standard deviation of 15 kilometers.

Which of these is the smallest approximate sample size required to obtain the desired margin of error?

(A) 5
(B) 7
(c) 10
(D) 15
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