Suppose You Wanted to Hold Up an Electron Against the Gravitational

Suppose you wanted to hold up an electron against the gravitational force by the attraction of a fixed proton some distance above it.How far above the electron would the proton have to be? (k = 1/4πε₀ = 9.0 × 10⁹ N ∙ m²/C²,e = 1.6 × 10^-19 C,m_proton = 1.67 × 10^-27 kg,m_electron = 9.11 × 10^-31 kg)

A) 1.5 m
B) 2.3 m
C) 3.7 m
D) 4.6 m
E) 5.1 m