Two small plastic spheres are given positive electrical charges. When they are $30\mathrm{.}0$ cm apart, the repulsive force between them has a magnitude $0\mathrm{.}220$ N $.$ One of the charges is three times the other. The charge on one of the plastic spheres is

$($A$)0\mathrm{.}0043C$

$($B$)0\mathrm{.}99C$

$($C$)2\mathrm{.}57C$

$($D$)1\mathrm{.}28C$

$($E$)1\mathrm{.}602{10}^{-19}C$

$($F$)$ None of these