The Sketch Below Shows Cross Sections of Equipotential Surfaces Between $\mu$

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.
-A point charge gains 50 $\mu$ J of electric potential energy when it is moved from point D to point G. Determine the magnitude of the charge.

A) 1.0 $\mu$ C
B) 1.3 $\mu$ C
C) 25 $\mu$ C
D) 50 $\mu$ C
E) 130 $\mu$ C