Coulomb's law and Newton's gravitation share the inverse-square form, yet gravity dominates at astronomical scales while electromagnetism dominates everywhere else. Why?

D. Because charge comes in two signs that cancel, and mass in one.

Between a proton and an electron the electrostatic force exceeds the gravitational by about 10³⁹, the disparity is not close. What suppresses it in bulk is cancellation, since ordinary matter holds almost exactly equal positive and negative charge, where mass has one sign and always adds. Both laws are inverse-square, so neither falls off faster; the asymmetry is entirely about cancellation.