An Uncharged Spherical Conducting Shell Surrounds a Charge -Q at the Center

An uncharged spherical conducting shell surrounds a charge -q at the center of the shell.Then charge +3q is placed on the outside of the shell.When static equilibrium is reached,the charges on the inner and outer surfaces of the shell are respectively

A) +q,-q.
B) -q,+q.
C) +q,+2q.
D) +2q,+q.
E) +3q,0.