A Proton Initially Moves Left to Right Long the X

A proton initially moves left to right long the x axis at a speed of 9 × 10³ m/s.It moves into an electric field,which points in the negative x direction,and travels a distance of 0.8 m before coming to rest.If the proton's mass and charge are 1.67 × 10−²⁷ kg and 1.60 × 10−¹⁹ C respectively,what is the magnitude of the electric field?
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A) 42.8 N/C
B) 0.053 N/C
C) 0.528 N/C
D) 0.66 N/C
E) 1.057 N/C