How Much Charge Must Be Placed on a 10 Cm

How much charge must be placed on a 10 cm diameter metal sphere so that the electric potential at the center of the sphere is 1.0 V? Assume that the electric potential is zero at points infinitely far away from the sphere.

A) 2.8 * 10^-13 C
B) 1.1 * 10^-12 C
C) 5.6 * 10^-12 C
D) 1.1 * 10^-11 C
E) 2.2 * 10^-11 C