What Is the 95% Confidence Interval for the Standard Deviation $08 < \sigma < 2.1$

Multiple Choice

What is the 95% confidence interval for the standard deviation of birth weights at Guelph General Hospital, if the standard deviation of the last 25 babies born there was 1.1 pounds?

A) $08 < \sigma < 2.1$
B) $0.7 < \sigma < 2.3$
C) $08 < \sigma < 1.9$
D) $09 < \sigma < 15$