Which statement describes nuclear binding energy?

Which statement describes nuclear binding energy?
A) It is the difference between the masses of the protons and neutrons and the mass of the nucleus.
B)It is the energy that is required to bind protons and neutrons together in a nucleus.
C)It is the energy that is required to overcome mass defect.
D)It is the energy that is required to overcome the electromagnetic force.
E)It is the result of converting mass to energy.