Two charge particles are placed at 1 m apart what is the minimum possible magnitude of electric force acting on each charge

Question

$(a)2.3\times10^{-28}\;N\;\qquad(b)\;2.3\times10^{-8}\;N\qquad(c)\;2.3\times10^{-24}\;N\qquad(d)\;2.3\times10^{-6}\;N$