Case 1: an Electron Is Released from Rest in a Uniform

Multiple Choice

Case 1: An electron is released from rest in a uniform electric field.Case 2: A proton is released from rest in a uniform electric field of the same magnitude as in case 1.How does the electric potential energy of the charge-field system behave in these cases?

A) In both cases,the potential energy increases.
B) In both cases,the potential energy decreases.
C) In case 1 the potential energy increases,but in case 2 it decreases.
D) In case 1 the potential energy decreases,but in case 2 it increases.