Two Small Balls, a and B, Attract Each Other Gravitationally

Multiple Choice

Two small balls, A and B, attract each other gravitationally with a force of magnitude F. If we now double both masses and the separation of the balls, what will now be the magnitude of the
Attractive force on each one?

A) F
B) 16 F
C) F/4
D) 4 F
E) 8 F