The hydrogen atom comprises of a proton of mass 1.67 x 10^-27 kg and an orbiting electron of mass 9.11 x 10^-31 kg. In one of the orbits, the electron is 5.3 x 10^-11 m from the proton. Determine the mutual attractive gravitational force among the electron and proton?
A) 9.3 x 10^-47 N
B) 7.0 x 10^-47 N
C) 5.4 x 10^-47 N
D) 1.8 x 10^-47 N
E) 3.6 x 10-47 N