(C) During $\beta^-$-decay,a neutron $(n)$ inside the nucleus transforms into a proton $(p)$,an electron $(e^-)$,and an antineutrino $(\bar{\nu}_e)$.T

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$A$ neutron in the nucleus decays emitting an electron

(C) During $\beta^-$-decay,a neutron $(n)$ inside the nucleus transforms into a proton $(p)$,an electron $(e^-)$,and an antineutrino $(\bar{\nu}_e)$.The process is represented as: $n \rightarrow p + e^- + \bar{\nu}_e$.Thus,the electron is created at the moment of decay and then ejected from the nucleus.