Breezewinds stock has exhibited a standard deviation in returns of 0.5, whereas Selectron stock has exhibited a standard deviation of 0.9. The correlation coefficient between the stock returns is 0.2. What is the standard deviation of a portfolio composed of 65% Breezewinds and 35% Selectron?
a. 0.49578
b. 0.32122
c. 0.50578
d. 0.56676