Why can't any star, no matter how massive, fuse elements heavier than iron?
A. Because the nucleons within iron have the least mass as possible
B. It could happen, we just have not yet observed a star massive enough to do this.
C. Actually, this occurs on a regular basis, which explains the great abundance of heavy elements.
D. Because elements heavier than iron have less average mass per nucleon
Answer: A
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Fill in the blank(s) with the appropriate word(s).