You have a portfolio with a standard deviation of 21% and an expected return of 19%. You are considering adding one of the two stocks in the following table. If after adding the stock you will have 30% of your money in the new stock and 70% of your money in your existing portfolio, which one should you add? Standard deviation of the portfolio with stock A Is %. (Round to tow decimal places.) Standard deviation of the portfolio with stock B Is %. (Round to tow decimal places.) Which stock should you add and why? (Select the best choice below.) Add A because the portfolio is less risky when A is added. Add B because the portfolio is less risky when B is added. Add either one because both portfolios are equally risky