Suppose you just created a portfolio by buying 100 shares of Stock A and 250 shares of Stock B. Stock A has a standard deviation of 14.5%, while Stock B has a standard deviation of 19.5%. The correlation between them is 39. At the time of purchase, Stock A was selling for $89.15 and Stock B was selling for $53.10 per share. What is the portfolio standard deviation? 18.25% b. 21.80% 16.09% d. 14.93% a