Find the 95% Confidence Interval for the Standard Deviation of the Lengths

Multiple Choice

Find the 95% confidence interval for the standard deviation of the lengths of pipes if a sample of 11 pipes has a standard deviation of 10.6 inches.

A) $54.9 < \sigma < 346.0$
B) $7.6 < \sigma < 9.6$
C) $7.4 < \sigma < 18.6$
D) $101.4 < \sigma < 123.4$