existing portiolio, which one should you add?

$\backslash$table$[[,\backslash$table$[[$Expected$],[$Return$]],\backslash$table$[[$Standard$],[$Deviation$]],\backslash$table$[[$Correlation with$],[$Your Portfolio's Returns$]]],[$Slock A$,14\%,24\%,0\mathrm{.}4],[$Slock B$,14\%,16\%,0\mathrm{.}6]]$

Standard deviation of the portfolio with stock $A$ is $\%.($Round to two decimal places $)$

Standard deviation of the partfolio with stoct $B$ is $\%.($Round to two decimal places.$)$

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

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

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

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