What happens when people are administered iodine-131?
A. It becomes nonradioactive in the body, which allows it to be tracked by doctors.
B. It reacts with other nonradioactive iodine isotopes in the body and then makes them radioactive.
C. It behaves like any other nonradioactive iodine isotope in the body, but it can be tracked by doctors.
D. It migrates through the body, targeting and destroying harmful cancer cells in the body.
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B. It reacts with other nonradioactive iodine isotopes in the body and then makes them radioactive.
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