A Positive Point Charge Q Is Placed at the Center $\frac { q } { 2 }$

A positive point charge q is placed at the center of an uncharged metal sphere insulated from the ground.The outside of the sphere is then grounded as shown.Then the ground wire is removed.A is the inner surface and B is the outer surface.Which statement is correct?

A) The charge on A is -q;that on B is +q.
B) The charge on B is -q;that on A is +q.
C) The charge is $\frac { q } { 2 }$ on A and on B.
D) There is no charge on either A or B.
E) The charge on A is -q;there is no charge on B.