Which of the following conclusions comparing either the charges present on sphere y and z or the masses of spheres y or z is supported?
A) The charges on y and z are equal; the mass of y is greater than the mass of z.
B) The charges on y and z are equal; the mass of y is less than the mass of z.
C) The charge on y is greater than the charge on z; the mass of y is equal to the mass of z.
D) The charge on y is less than the charge on z; the mass of y is equal to the mass of z.