The average annual return over the period $1926-2021$ for the S&P $500$ is $11\%,$ and the standard deviation of returns is

$20\mathrm{.}4\%.$ Based on these numbers, what is a $67\%$ confidence interval for $2022$ returns?

A$.-28\mathrm{.}2\%,50\mathrm{.}2\%$

B$.-1\mathrm{.}4\%,18\mathrm{.}8\%$

C$.-9\mathrm{.}4\%,31\mathrm{.}4\%$

D$.-28\mathrm{.}2\%,44\%$