The two plates of a parallel$-$plate capacitor carry a fixed amount of charge. The magnitude of the electric field inside the capacitor is $3$ N$/$C$.$ After doubling the distance between the two plates the magnitude of the electric field is $($in N$/$C$)$

A: $0\mathrm{.}30$ B: $2\mathrm{.}2$ C: $3\mathrm{.}0$ D: $12$ E: $24$