A Positive Point Charge Q Is Placed at the Center

Multiple Choice

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
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.