The reason radioactive isotopes can be followed through the steps of a chemical reaction or industrial process is that they
a.
are stable.
b.
give off radiation.
c.
do not react chemically as nonradioactive isotopes do.
d.
do not decay.

I think the correct answer from the choices listed above is option C. The reason radioactive isotopes can be followed through the steps of a chemical reaction or industrial process is that they do not react chemically as nonradioactive isotopes do. Hope this answers the question.

Answer is to avoid experimental error