Nuclear binding energy is necessary to overcome which of the following A. Einstain's mass defect B. Kinetic energy of the nucleus C. Repulsion of the protons D. weak nuclear force

C. the repulsion of the protons. In chemistry, what is vital is the forward and reverse reactions. If binding is a forward process, repulsion/unbinding is the reverse reaction. Therefore, binding must overcome the repulsion of the nucleic subparticles (essentially protons)