Three Possible Configurations for an Electron E and a Proton

Three possible configurations for an electron e and a proton p are shown below. Take the zero of potential to be at infinity and rank the three configurations according to the potential at S, from most negative to most positive.

A) 1, 2, 3
B) 3, 2, 1
C) 2, 3, 1
D) 1 and 2 tie, then 3
E) 1 and 3 tie, then 2