Stars like the Sun probably do not form iron cores during their evolution because
A. the iron they make by nucleosynthesis is all fused into uranium.
B. their strong magnetic fields keep their iron in their atmospheres.
C. all the iron is ejected when they become planetary nebulas.
D. their cores never get hot enough for them to make iron by nucleosynthesis.
E. None of these choices is correct.
Answer: D
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