¹⁴C Can Be Used to Determine the Ages of Fossil

¹⁴C can be used to determine the ages of fossil organisms because

A) all organisms contain many carbon compounds.
B) ¹⁴C has a regular rate of decay to ¹⁴N.
C) the ratio of ¹⁴C to ¹²C in living organisms is always the same as that in the atmosphere.
D) the production of new ¹⁴C in the atmosphere just balances the natural radioactive decay of ¹⁴C.
E) All of the above