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When combined in a nucleus the total mass of the protons and neutrons is less than the sum of their individual masses. This suggests that

[A].	the mass defect is due to electrons revolving round the nucleus	[B].	the mass defect accounts for the energy of the electrons revolving round the nucleus
[C].	the mass defect accounts for the binding energy holding the particles together in the nucleus	[D].	the experiments are not accurate enough

Answer: Option C