A "Carbon Star" Has More Carbon on Its Surface Than

A "carbon star" has more carbon on its surface than does the Sun. This is the result of:

A) neutrinos, which escape easily from the core of a star but react with the cool hydrogen at its surface to form carbon.
B) helium flash, in which the explosion blasts carbon from the core into the surface layers.
C) dredge-up, in which the convective envelope transports material from a star's core to its surface.
D) mass loss, which strips away the outer envelope from an old star and reveals the carbon-rich core.

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