In the Nuclear Fusion of Four Hydrogen Nuclei to Form

In the nuclear fusion of four hydrogen nuclei to form a helium nucleus, the resultant helium nucleus

A) is more massive than the four hydrogen nuclei, the missing mass being converted into energy
B) is radioactive, generating energy by ejected electrons from beta decay
C) is less massive than the four hydrogen nuclei, the missing mass being converted into energy
D) has exactly the same mass as the four hydrogen nuclei, the energy being generated by the helium nucleus rearranging itself by emitting a gamma ray