Which One of the Following Statements Most Accurately Describes the Center

Which one of the following statements most accurately describes the center of gravity of an object?

A) It is the point where gravity acts on the object.
B) It is the point where all the mass is concentrated.
C) It must be experimentally determined for all objects.
D) It is the point on the object where all the weight is concentrated.
E) It is the point from which the torque produced by the weight of the object can be calculated.