Estimate the Standard Deviation in Calories for These Randomly Selected $328.266 < \sigma ^ { 2 } < 1621.082$

Estimate the standard deviation in calories for these randomly selected standard-size candy bars with 95% confidence. (The number of calories is listed for each.) Assume the variable is
Normally distributed.
218 219 212 225 271 266 246
211 238 250 281 227 278 260

A) $328.266 < \sigma ^ { 2 } < 1621.082$
$18.1 < \sigma < 40.3$

B) $14.145 < \sigma ^ { 2 } < 69.853$
$3.8 < \sigma < 8.4$

C) $13.135 < \sigma ^ { 2 } < 64.863$
$3.6 < \sigma < 8.1$

D) $353.518 < \sigma ^ { 2 } < 1745.781$
$18.8 < \sigma < 41.8$