The average annual return for the S$\backslash$&P $500$ from $1886$ to $2020$ is $\backslash (9\mathrm{.}5\backslash \%\backslash ),$ with a standard deviation of $\backslash (18\backslash \%\backslash ).$ Based on these numbers, what is a $\backslash (95\backslash \%\backslash )$ confidence interval for $2021\text{'}$s returns?

$[-13\mathrm{.}25\backslash \%,22\mathrm{.}75\backslash \%]$

$[-16\mathrm{.}5\backslash \%,35\mathrm{.}5\backslash \%]$

$[-26\mathrm{.}5\backslash \%,45\mathrm{.}5\backslash \%]$

$[-11\mathrm{.}5\backslash \%,30\mathrm{.}5\backslash \%]$