In the Figure, Point a Is a Distance L Away

In the figure, point A is a distance L away from a point charge Q. Point B is a distance 4L away from Q. What is the ratio of the electric field at B to that at A, E_B/E_A?

A) 1/16
B) 1/9
C) 1/4
D) 1/3
E) This cannot be determined since neither the value of Q nor the length L is specified.