A $20-$mm$-$thick $\backslash$times $75-$mm$-$wide bar elongates $6\mathrm{.}4$ mm under an axial load of $450$ kN $.$ The bar is

$1\mathrm{.}6-$m long. Poisson's ratio is $0\mathrm{.}32$ for the material. The longitudinal strain is most nearly:

A$.0\mathrm{.}00200$m$($m$)/($m$)$m

B$.0\mathrm{.}00225$m$($m$)/($m$)$m

C$.0\mathrm{.}00250$m$($m$)/($m$)$m

D$.0\mathrm{.}00250$m$($m$)/($m$)$m

E$.,0\mathrm{.}00275$m$($m$)/($m$)$m

F$.,0\mathrm{.}00300$m$($m$)/($m$)$m

G$.0\mathrm{.}00325$m$($m$)/($m$)$m

H$.,0\mathrm{.}00350$m$($m$)/($m$)$m

I. $,0\mathrm{.}00375$m$($m$)/($m$)$m

J$.,0\mathrm{.}00400$m$($m$)/($m$)$m