Two conducting spheres are separated by a distance $d$ : One sphere carries charge $+Q$ and the other carries $-2Q.$ They each feel an attractive force $F.$ If a third of the $2Q$ charge on the negative sphere is transferred to the positive sphere, what is the magnitude of the new attractive force?

fide answer choices

$\frac{1}{3}(\frac{4}{3})$

incorrect:

$\frac{10F}{9}$

$($B$)\frac{4F}{9}$

$($C$)\frac{5F}{9}$

$\frac{8F}{9}$

$\frac{2F}{9}$