Stellar Cores,near the End of a Star's Lifetime,produce Iron by Fusion.The

Stellar cores,near the end of a star's lifetime,produce iron by fusion.The reason stellar cores don't go past iron is that

A) iron in stellar cores tends to spontaneously fission.
B) Iron is the most dense material in solid form
C) iron nuclei are the most tightly bound per nucleon.
D) iron is ferromagnetic.
E) iron is heavy.