The upper and lower specification limits on a valve diameter are $11\mathrm{.}01mm$ and $10\mathrm{.}98mm,$ respectively. Measurements in $60$ valves resulted in a mean of $10\mathrm{.}991mm$ and a sample standard deviation, $,$ of $0\mathrm{.}0035mm.$ If it is assumed that the process mean is not centered between the specification limits$,$ what is the process capability index, $C_{kp},$ that takes process centering into account?

A$.0\mathrm{.}90$

B$.1\mathrm{.}05$

C$.1\mathrm{.}43$

D$.1\mathrm{.}81$