As a Proton Moves in a Direction Perpendicular to The \vec

As a proton moves in a direction perpendicular to the $\vec { E }$ field lines

A) it is moving from the field's low potential to high potential and the electric potential energy of the system proton-electric field is increasing.
B) it is moving from the field's low potential to high potential and the electric potential energy of the system proton-electric field is decreasing.
C) it is moving from the field's high potential to low potential and the electric potential energy of the system proton-electric field is increasing.
D) it is moving from the field's high potential to low potential and the electric potential energy of the system proton-electric field is decreasing.
E) both the field's electric potential and electric potential energy of the system proton-electric field remain constant.