The Sketch Shows Cross Sections of Equipotential Surfaces Between Two

The sketch shows cross sections of equipotential surfaces between two charged conductors shown in solid black. Points on the equipotential surfaces near the conductors are labeled A, B, C, ..., H.
-What is the magnitude of the potential difference between points A and H?

A) 100 V
B) 200 V
C) 400 V
D) 600 V
E) 700 V