Susan Wants Fo Find A $99 \%$ Confidence Interval for the Time It Takes Her to Drive

Susan wants fo find a $99 \%$ confidence interval for the time it takes her to drive home from school. She kept records for 15 days and found her average time to drive was 17.5 minutes with a standard deviation of 4.7 minutes. Calculate Susan's maximum error of estimate.

A) 2.38
B) 3.12
C) 2.11
D) 1.68