Two identical metallic spherical shells A and B having charges $+4\; Q$ and $10\; Q$ are kept a certain distance apart. A third identical uncharged sphere C is first placed in contact with sphere A and then with sphere B, then spheres A and B are brought in contact and then separated. Find the charge on the spheres A and B.

Question

$\begin{array}{1 1}(A)\;Q \\(B)\;-Q\\(C)\;2Q \\(D)\;0 \end{array}$