The mass of proton, neutron, and helium nucleus are respectively ( 1.0073 , u ), ( 1.0087 , u ), and ( 4.0015 , u ). The binding energy of helium nucleus is:
a. ( 26.73 , MeV )
b. ( 28.29 , MeV )
c. ( 24.58 , MeV )
d. ( 23.71 , MeV )