The preexponential and activation energy for the diffusion of iron in cobalt are $1\mathrm{.}1{10}^{-5}\frac{m^2}{s}$ and $180,000\frac{J}{m}ol,$ respectively. At what temperature will the diffusion coefficient approximately have a value of $2\mathrm{.}1{10}^{-14}\frac{m^2}{s}?$

Select one:

a$.807C$

b$.927C$

c$.687C$

d$.1047C$