A β^- Decay Occurs in an Unstable Nucleus When

Multiple Choice

A β^- decay occurs in an unstable nucleus when

A) a proton is converted to an electron by the strong force.
B) a proton is converted to a neutron by the strong force.
C) a neutron is converted to a proton by the weak force.
D) a neutron is converted to an alpha particle by the weak force.
E) a neutron is converted to a beta particle by the weak force.