When a Small,positively Charged Metal Ball Comes in Contact with the Interior

When a small,positively charged metal ball comes in contact with the interior of a positively charged metal shell,

A) the charge on the ball becomes negative.
B) the amount of positive charge on the ball increases.
C) the positive charge on the shell decreases.
D) the charge on the shell and the ball reach the same value.
E) the ball loses all of its excess charge.