Consider a Uniform Electric Field of 50

Consider a uniform electric field of 50. N/C directed toward the East. If the voltage measured relative to ground at a given point in the field is 80. V, what is the voltage at a point 1.0 m directly East of the point?

A) 15. V
B) 30. V
C) 0.15 kV
D) impossible to calculate from the information given
E) 30. kV