In the Sun, four hydrogen nuclei react to form a helium nucleus, ... ...

 In the Sun, four hydrogen nuclei react to form a helium nucleus, so that the net reaction looks like image where the neutrino is massless or nearly so. What is the mass deficit for this reaction?
(A) 0.02872 amu
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 16. Atomic and Nuclear Physics