Three helium nuclei fuse together, forming one carbon nucleus. The mass of carbon is less than
Three times the mass of helium. When helium fuses into carbon, which of the following occurs?
a. Rest‐mass energy is converted into some other form of energy
b. Some other form of energy is converted into rest‐mass energy
c. The chemical reaction changed the total mass
d. The mass of three helium nuclei turned into one carbon nucleus and other smaller
Particles, such as protons and neutrons.

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Since the mass of the 3 helium nuclei together do not give the mass of a carbon nucleus, this means that some of the mass of the helium went somewhere. Where do you think they have gone?

What do you know about the rest mass energy? Can you apply this here?