20 pts to whoever helps please

A simple random sample of 20 women's hair lengths prior to entering a local hair salon is found to have a standard deviation of 1.2 inches. Use a 0.01 significance level to test the claim that the standard deviation of all women's hair lengths prior to entering the hair salon is greater than 1.0 in. Find the critical value(s) needed to test the claim.
a. 36.191
b. 7.633, 36. 191
c. 38.582
d. 6.844, 38.582