A proton initially moves left to right long the x axis at a speed of $9\mathrm{.}0103$ m$/$s$.$ It moves into an electric field, which points in the negative x direction, and travels a distance of $0\mathrm{.}8$ m before coming to rest. If the proton's mass and charge are $1\mathrm{.}671027$ kg and $1\mathrm{.}601019$ C respectively, what is the magnitude of the electric field?$$

a$.$

$6\mathrm{.}6$E$1$ N$/$C

b$.$

$5\mathrm{.}3$E$2$ N$/$C

c$.$

$4\mathrm{.}3$E$+1$ N$/$C

d$.$

$5\mathrm{.}3$E$1$ N$/$C

e$.$

$1\mathrm{.}1$E$+0$ N$/$C