An Electron and a Proton, Are Released Simultaneously from Rest

An electron and a proton, are released simultaneously from rest and start to move towards each other because of the attractive Coulomb force between them. They are initially separated by a distance d. The two particles eventually collide. When they collide,

A) they are closer to the electron's initial position.
B) they are at the midpoint of their initial separation.
C) they are closer to the proton's initial position.
D) Not enough data is given to predict where they collide.