Which of the data sets represented by the following histograms has the smallest standard deviation?

Select the correct answer below:

A histogram has a horizontal axis from 0.00 to 20.00 in increments of 2.00 and a vertical axis from 0 to 40 in increments of 10. The histogram has vertical bars of width 2.00 starting at the horizontal axis value 2.00. The approximate heights of the bars are as follows, where the left horizontal axis label is listed first and the approximate height is listed second: 2.00, 7; 4.00, 8; 6.00, 12; 8.00, 16; 10.00, 12; 12.00, 10; 14.00, 18; 16.00, 15.

A histogram has a horizontal axis from 0.00 to 20.00 in increments of 2.00 and a vertical axis from 0 to 40 in increments of 10. The histogram has vertical bars of width 2.00 starting at the horizontal axis value 4.00. The approximate heights of the bars are as follows, where the left horizontal axis label is listed first and the approximate height is listed second: 4.00, 19; 6.00, 31; 8.00, 36; 10.00, 31; 12.00, 26.

A histogram has a horizontal axis from 0.00 to 20.00 in increments of 2.00 and a vertical axis from 0 to 40 in increments of 10. The histogram has vertical bars of width 2.00 starting at the horizontal axis value 0.00. The approximate heights of the bars are as follows, where the left horizontal axis label is listed first and the approximate height is listed second: 0.00, 3; 2.00, 14; 4.00, 6; 6.00, 17; 8.00, 37; 10.00, 27; 12.00, 21; 14.00, 11; 16.00, 18; 18.00, 17.