A portfolio consisting of four stocks is expected to produce

A portfolio consisting of four stocks is expected to produce returns of 9%, 11%, 3% and 17%, respectively, over the next four years. What is the standard deviation of these expected returns?respectively, over the next four years. What is the standard deviation of these expected returns?
A) 5.00%
B) 5.77%
C) 25.00%
D) 33.33%