A) The nucleus loses two protons and two neutrons
B) The nucleus emits only a photon
C) A proton becomes a neutron and emits a positron
D) A neutron becomes a proton with electron and antineutrino emission
Answer: D
Explanation: A neutron in the nucleus becomes a proton, emitting an electron and an electron antineutrino. The atomic number increases by one while the mass number stays unchanged.
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