A barbecue sauce producer sells its product in a $24-$ounce bottle. Their current process mean is $23\mathrm{.}8$ ounces with a standard deviation of $0\mathrm{.}24$ ounces. If their tolerance limits are set at $24$ ounces plus or minus $1$ ounce, what is the process capability index$/$ratio of the bottle filling process?

Group of answer choices

$1\mathrm{.}67$

$1\mathrm{.}50$

$\mathrm{.}90$

$1\mathrm{.}05$