You have a portfolio with a standard deviation of $20\%$ and an expected return of $18\%.$ You are considering adding

one of the two stocks in the following table. If after adding the stock you will have $20\%$ of your money in the new

stock and $80\%$ of your money in your existing portfolio, which one should you add?

Standard deviation of the portfolio with stock $A$ is

$\%.($Round to two decimal places.$)$

Standard deviation of the portfolio with stock B is

$\%.($Round to two decimal places.$)$

Which stock should you add and why? $($Select the best choice below.$)$

A$.$ Add $B$ because the portfolio is less risky when $B$ is added.

B$.$ Add A because the portfolio is less risky when $A$ is added.

C$.$ Add either one because both portfolios are equally risky.