The Sketch Below Shows Cross Sections of Equipotential Surfaces Between

The sketch below shows cross sections of equipotential surfaces between two charged conductors that are shown in solid grey. Various points on the equipotential surfaces near the conductors are labeled A, B, C, ..., I.
-What is the potential difference between points B and E?

A) 10 V
B) 30 V
C) 40 V
D) 50 V
E) 60 V