Two spherical metal objects are brought together in a vacuum to a separation distance of 1 mm. If a Coulomb of charge could be placed on one of the objects without any electrical discharge the force of attraction between the two objects would be

A. 9 × 10^12 N
B. 9×10^13 N
C. 9 × 10^14 N
D. 9 × 10^15 N