As a Proton Moves in a Direction Perpendicular to the Electric

Multiple Choice

As a proton moves in a direction perpendicular to the electric field lines

A) it is moving from low potential to high potential and gaining electric potential energy.
B) it is moving from low potential to high potential and losing electric potential energy.
C) it is moving from high potential to low potential and gaining electric potential energy.
D) it is moving from high potential to low potential and losing electric potential energy.
E) both its electric potential and electric potential energy remain constant.