In Massive Stars,three Helium Nuclei Fuse Together,forming a Carbon Nucleus,and

Multiple Choice

In massive stars,three helium nuclei fuse together,forming a carbon nucleus,and this reaction heats the core of the star.The net mass of the three helium nuclei must therefore be

A) higher than that of the carbon nucleus.
B) less than that of the carbon nucleus.
C) the same as that of the carbon nucleus because mass is always conserved.
D) the same as that of the carbon nucleus because energy is always conserved.