Please give a clear solutions with all steps
Q. Four hollow concentric conducting spheres of radii R, 2R, 3R and 4R are having charges - 1 $\mu$C, 2 $\mu$C, - 3 $\mu$C, and + 4$\mu$C respectively. If the spheres of radii 2R and 3R are connected with a metallic wire, then the charge transferred between the spheres is
A) 0 $\mu$C
B) 0.5 $\mu$C
C) 1 $\mu$C
D) 3 $\mu$C