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b
The mass number of the daughter atom is 1 less than the parent atom.
a
The mass number of the daughter atom is 1 more than the parent atom.
b
The mass number of the daughter atom is 1 less than the parent atom.
c
The mass number of the daughter atom is 4 less than the parent atom.
d
The mass number of the daughter atom is the same as the parent atom.
The mass number of the daughter atom is 1 less than the parent atom.