Two conducting spheres of different radii each carry a charge +Q. Which of the following occurs when the two spheres are touched together? ( )

A、Positive charge flows from the larger sphere to the smaller sphere until the electric field at the surface of each sphere is the same.
B、No charge flows.
C、Positive charge flows from the smaller sphere to the larger sphere until the electric field at the surface of each sphere is the same.
D、Positive charge flows from the larger sphere to the smaller sphere until the electric potential at the surface of each sphere is the same.
E、Positive charge flows from the smaller sphere to the larger sphere until the electric potential at the surface of each sphere is the same.