In the radioactive decay process, if a parent isotope A decays into a daughter isotope B, and B decays further, what is the rate of change of atoms in sample B?
A) the rate at which A decays minus the rate at which B decays
B) the rate at which A decays plus the rate at which B is produced
C) the rate at which B is produced minus the rate at which B decays
D) the rate at which B is produced plus the rate at which B decays
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