What do supernova have to do with heavy elements?

When  a star dies, it is called a  supernova.  A supernova contains massive amounts of energy, and the hydrogen and helium that was originally in the star turns into heavier elements ranging from oxygen to iron to gold.

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Explanation:

During the supernova nucleosynthesis, the r-process creates heavy isotopes, which decay after the event to the first stable isotope, thereby creating the neutron-rich stable isotopes of all heavy elements. The neutron capture occurs in high neutron density with high-temperature conditions.

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i think the answer is a, hope this is right, that would be my best guess.