Which of the Following Statements About Radioactive Isotopes Is True

Multiple Choice

Which of the following statements about radioactive isotopes is true?

A) The nuclei of radioactive isotopes are unusually stable, but the atoms tend to lose electrons.
B) When given a choice between radioactive and nonradioactive isotopes of the same atom, living cells are more likely to incorporate the radioactive isotopes into their structures.
C) The energy emitted by radioactive isotopes can cause molecular damage in cells.
D) Radioactive elements are natural and therefore not harmful.