You have a portfolio with a standard deviation of $23\%$ and an expected return of $20\%.$ You are considering adding one of the two stocks in the following table: 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.$)$

Data table

$($Click on the following icon $$ in order to copy its contents into a spreadsheet.$)$

$\backslash$table$[[,$Expected Return,Standard Deviation,$\backslash$table$[[$Correlation with Your$],[$Portfolio$\text{'}$s Returns$]]],[$Stock A$,15\%,22\%,0\mathrm{.}3],[$Stock B$,15\%,18\%,0\mathrm{.}7]]$