The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit). The binding energy of $^4_2He$ is (Given : helium nucleus mass ≈ 4.0015 u)

Question

( A ) 0.0305 J
( B ) 0.061 u
( C ) 0.0305 erg
( D ) 28.4 MeV