To find the standard deviation of the diameter of wooden dowels, the manufacturer measures 19 randomly selected dowels and finds the standard deviation of the sample to be s = 0.16. Find the 95% confidence interval for the population standard deviation σ.

A. 0.13 < σ < 0.22

B. 0.12 < σ < 0.24

C. 0.11 < σ < 0.25

D. 0.15 < σ < 0.21