Returns for the Alcoff Company over the last $3$ years are shown below. What's the standard deviation of the firm's returns? $($Hint: This is a sample, not a complete population, so the sample standard deviation formula should be used.$)$

Year Return

$201021\mathrm{.}00\%$

$200912\mathrm{.}50\%$

$200813\mathrm{.}00\%$

Select the correct answer.

a$.17\mathrm{.}34\%$

b$.17\mathrm{.}50\%$

c$.17\mathrm{.}38\%$

d$.17\mathrm{.}42\%$

e$.17\mathrm{.}46\%$