How Can an Electron Be Ejected from a Nucleus in Beta

How can an electron be ejected from a nucleus in beta decay if it wasn't in the nucleus to begin with?

A) The electron doesn't come from the nucleus-it comes from an orbit circling the nucleus.
B) A neutron in the nucleus turns into a proton,electron,and a neutrino.
C) A proton in the nucleus turns into a neutron,electron,and a neutrino.
D) none of the above

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