The upper and lower specification limits for the thickness of a component are $2\mathrm{.}5$ inches and $2$ inches$$ respectively, with a process target of $2\mathrm{.}25$ inches. The process standard deviation is $0\mathrm{.}1$ inches and the process average is $2\mathrm{.}3$ inches. What is the process capability$$ index?

A$.$

$1\mathrm{.}50$

B$.$

$1\mathrm{.}75$

C$.$

$1\mathrm{.}25$

D$.$

$1\mathrm{.}00$

which one of these is it thank you!