You find that Logan ltd had returns of $15\%,-17\%,23\%$ and$11\%$ for four of the last five years. The average return for the past five years is $10\%.$ What was the stock's standard deviation last year?

A$.0\mathrm{.}10$

B$.0\mathrm{.}1572$

C$.0\mathrm{.}2470$

D$.0\mathrm{.}180$